21756039426 has 32 divisors (see below), whose sum is σ = 52741915200. Its totient is φ = 6592739040.

The previous prime is 21756039421. The next prime is 21756039427. The reversal of 21756039426 is 62493065712.

21756039426 is a `hidden beast` number, since 2 + 17 + 5 + 603 + 9 + 4 + 26 = 666.

It is not an unprimeable number, because it can be changed into a prime (21756039421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18312571 + ... + 18313758.

It is an arithmetic number, because the mean of its divisors is an integer number (1648184850).

Almost surely, 2^21756039426 is an apocalyptic number.

21756039426 is an abundant number, since it is smaller than the sum of its proper divisors (30985875774).

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

21756039426 is a wasteful number, since it uses less digits than its factorization.

21756039426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36626351 (or 36626345 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

The spelling of 21756039426 in words is "twenty-one billion, seven hundred fifty-six million, thirty-nine thousand, four hundred twenty-six".