20887502421 has 32 divisors (see below), whose sum is σ = 29999185920. Its totient is φ = 12880740096.

The previous prime is 20887502381. The next prime is 20887502437. The reversal of 20887502421 is 12420578802.

It is not a de Polignac number, because 20887502421 - 2²⁷ = 20753284693 is a prime.

It is a super-2 number, since 2×20887502421² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20887502421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20887502021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 677970 + ... + 708108.

It is an arithmetic number, because the mean of its divisors is an integer number (937474560).

Almost surely, 2^20887502421 is an apocalyptic number.

It is an amenable number.

20887502421 is a deficient number, since it is larger than the sum of its proper divisors (9111683499).

20887502421 is a wasteful number, since it uses less digits than its factorization.

20887502421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30393.

The product of its (nonzero) digits is 71680, while the sum is 39.

The spelling of 20887502421 in words is "twenty billion, eight hundred eighty-seven million, five hundred two thousand, four hundred twenty-one".