21339155474 has 96 divisors (see below), whose sum is σ = 42923252736. Its totient is φ = 7738830720.

The previous prime is 21339155471. The next prime is 21339155477. The reversal of 21339155474 is 47455193312.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21339155471) and next prime (21339155477).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21339155471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2031524 + ... + 2042000.

It is an arithmetic number, because the mean of its divisors is an integer number (447117216).

Almost surely, 2^21339155474 is an apocalyptic number.

21339155474 is an abundant number, since it is smaller than the sum of its proper divisors (21584097262).

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

21339155474 is a wasteful number, since it uses less digits than its factorization.

21339155474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10568 (or 10549 counting only the distinct ones).

The product of its digits is 453600, while the sum is 44.

The spelling of 21339155474 in words is "twenty-one billion, three hundred thirty-nine million, one hundred fifty-five thousand, four hundred seventy-four".