21020521041 has 24 divisors (see below), whose sum is σ = 32862939200. Its totient is φ = 12870687456.

The previous prime is 21020521019. The next prime is 21020521051. The reversal of 21020521041 is 14012502012.

21020521041 is a `hidden beast` number, since 2 + 102 + 0 + 521 + 0 + 41 = 666.

It is not a de Polignac number, because 21020521041 - 2⁹ = 21020520529 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21020521051) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 428131 + ... + 474696.

Almost surely, 2^21020521041 is an apocalyptic number.

It is an amenable number.

21020521041 is a deficient number, since it is larger than the sum of its proper divisors (11842418159).

21020521041 is a wasteful number, since it uses less digits than its factorization.

21020521041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 903045 (or 903042 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The spelling of 21020521041 in words is "twenty-one billion, twenty million, five hundred twenty-one thousand, forty-one".