21426374056 has 16 divisors (see below), whose sum is σ = 40177991700. Its totient is φ = 10712242944.

The previous prime is 21426374041. The next prime is 21426374083. The reversal of 21426374056 is 65047362412.

It can be written as a sum of positive squares in 2 ways, for example, as 21318920100 + 107453956 = 146010^2 + 10366^2 .

It is a super-2 number, since 2×21426374056² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16411 + ... + 207658.

Almost surely, 2^21426374056 is an apocalyptic number.

It is an amenable number.

21426374056 is a deficient number, since it is larger than the sum of its proper divisors (18751617644).

21426374056 is a wasteful number, since it uses less digits than its factorization.

21426374056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236028 (or 236024 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 40.

The spelling of 21426374056 in words is "twenty-one billion, four hundred twenty-six million, three hundred seventy-four thousand, fifty-six".