20963061521 has 8 divisors (see below), whose sum is σ = 21689278464. Its totient is φ = 20239968960.

The previous prime is 20963061499. The next prime is 20963061527. The reversal of 20963061521 is 12516036902.

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

It is a cyclic number.

It is not a de Polignac number, because 20963061521 - 2³⁴ = 3783192337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20963061527) 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, 767441 + ... + 794286.

It is an arithmetic number, because the mean of its divisors is an integer number (2711159808).

Almost surely, 2^20963061521 is an apocalyptic number.

It is an amenable number.

20963061521 is a deficient number, since it is larger than the sum of its proper divisors (726216943).

20963061521 is a wasteful number, since it uses less digits than its factorization.

20963061521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1562191.

The product of its (nonzero) digits is 19440, while the sum is 35.

The spelling of 20963061521 in words is "twenty billion, nine hundred sixty-three million, sixty-one thousand, five hundred twenty-one".