21042746928 has 120 divisors (see below), whose sum is σ = 69474569216. Its totient is φ = 5818262400.

The previous prime is 21042746917. The next prime is 21042746939. The reversal of 21042746928 is 82964724012.

21042746928 is a `hidden beast` number, since 210 + 427 + 4 + 6 + 9 + 2 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (21042746917) and next prime (21042746939).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 305458 + ... + 367953.

Almost surely, 2^21042746928 is an apocalyptic number.

21042746928 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21042746928 is an abundant number, since it is smaller than the sum of its proper divisors (48431822288).

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

21042746928 is a wasteful number, since it uses less digits than its factorization.

21042746928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673463 (or 673454 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The spelling of 21042746928 in words is "twenty-one billion, forty-two million, seven hundred forty-six thousand, nine hundred twenty-eight".