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1021204040 = 23533297669
BaseRepresentation
bin111100110111100…
…101011001001000
32122011120112120212
4330313211121020
54042412012130
6245155540252
734210043153
oct7467453110
92564515525
101021204040
1148449678a
12245bba688
1313375265c
14998aac9a
155e9bde95
hex3cde5648

1021204040 has 32 divisors (see below), whose sum is σ = 2298699000. Its totient is φ = 408305664.

The previous prime is 1021204021. The next prime is 1021204049. The reversal of 1021204040 is 404021201.

It can be written as a sum of positive squares in 4 ways, for example, as 963109156 + 58094884 = 31034^2 + 7622^2 .

It is not an unprimeable number, because it can be changed into a prime (1021204049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129326 + ... + 136994.

Almost surely, 21021204040 is an apocalyptic number.

1021204040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021204040 is an abundant number, since it is smaller than the sum of its proper divisors (1277494960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1021204040 is a wasteful number, since it uses less digits than its factorization.

1021204040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11009 (or 11005 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 1021204040 is about 31956.2832632332. The cubic root of 1021204040 is about 1007.0186368215.

Adding to 1021204040 its reverse (404021201), we get a palindrome (1425225241).

The spelling of 1021204040 in words is "one billion, twenty-one million, two hundred four thousand, forty".

Divisors: 1 2 4 5 8 10 20 40 3329 6658 7669 13316 15338 16645 26632 30676 33290 38345 61352 66580 76690 133160 153380 306760 25530101 51060202 102120404 127650505 204240808 255301010 510602020 1021204040