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1000121021 = 1501366617
BaseRepresentation
bin111011100111001…
…010001010111101
32120200220102010022
4323213022022331
54022012333041
6243124021525
733532613504
oct7347121275
92520812108
101000121021
114735a67a9
1223ab318a5
1312c2802b3
1496b7d83b
155cc0724b
hex3b9ca2bd

1000121021 has 4 divisors (see below), whose sum is σ = 1000202652. Its totient is φ = 1000039392.

The previous prime is 1000120997. The next prime is 1000121041. The reversal of 1000121021 is 1201210001.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 247716121 + 752404900 = 15739^2 + 27430^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-1000121021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000121041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18296 + ... + 48321.

It is an arithmetic number, because the mean of its divisors is an integer number (250050663).

Almost surely, 21000121021 is an apocalyptic number.

It is an amenable number.

1000121021 is a deficient number, since it is larger than the sum of its proper divisors (81631).

1000121021 is an equidigital number, since it uses as much as digits as its factorization.

1000121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81630.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 1000121021 is about 31624.6900538171. The cubic root of 1000121021 is about 1000.0403387061.

Adding to 1000121021 its reverse (1201210001), we get a palindrome (2201331022).

The spelling of 1000121021 in words is "one billion, one hundred twenty-one thousand, twenty-one".

Divisors: 1 15013 66617 1000121021