21087914428 has 24 divisors (see below), whose sum is σ = 42179322752. Its totient is φ = 9036928944.

The previous prime is 21087914413. The next prime is 21087914443. The reversal of 21087914428 is 82441978012.

It is an interprime number because it is at equal distance from previous prime (21087914413) and next prime (21087914443).

It is a super-3 number, since 3×21087914428³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 435151 + ... + 481177.

Almost surely, 2^21087914428 is an apocalyptic number.

21087914428 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21087914428 is an abundant number, since it is smaller than the sum of its proper divisors (21091408324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21087914428 is a wasteful number, since it uses less digits than its factorization.

21087914428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62401 (or 62399 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 46.

The spelling of 21087914428 in words is "twenty-one billion, eighty-seven million, nine hundred fourteen thousand, four hundred twenty-eight".