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21081002 = 222814621
BaseRepresentation
bin101000001101…
…0101110101010
31110200000200212
41100122232222
520344043002
62031501122
7344120435
oct120325652
943600625
1021081002
1110999518
1270877a2
1344a1487
142b2a81c
151cb6352
hex141abaa

21081002 has 8 divisors (see below), whose sum is σ = 31642212. Its totient is φ = 10533600.

The previous prime is 21080987. The next prime is 21081017. The reversal of 21081002 is 20018012.

It is an interprime number because it is at equal distance from previous prime (21080987) and next prime (21081017).

It can be written as a sum of positive squares in 2 ways, for example, as 21077281 + 3721 = 4591^2 + 61^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2252 + ... + 6872.

Almost surely, 221081002 is an apocalyptic number.

21081002 is a deficient number, since it is larger than the sum of its proper divisors (10561210).

21081002 is a wasteful number, since it uses less digits than its factorization.

21081002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6904.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 21081002 is about 4591.4052315168. The cubic root of 21081002 is about 276.2466901046.

Adding to 21081002 its reverse (20018012), we get a palindrome (41099014).

The spelling of 21081002 in words is "twenty-one million, eighty-one thousand, two".

Divisors: 1 2 2281 4562 4621 9242 10540501 21081002