21274134740 has 48 divisors (see below), whose sum is σ = 46633950720. Its totient is φ = 8136902400.

The previous prime is 21274134689. The next prime is 21274134767. The reversal of 21274134740 is 4743147212.

It is a self number, because there is not a number n which added to its sum of digits gives 21274134740.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1796840 + ... + 1808640.

It is an arithmetic number, because the mean of its divisors is an integer number (971540640).

Almost surely, 2^21274134740 is an apocalyptic number.

21274134740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21274134740 is an abundant number, since it is smaller than the sum of its proper divisors (25359815980).

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

21274134740 is a wasteful number, since it uses less digits than its factorization.

21274134740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15752 (or 15750 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 35.

The spelling of 21274134740 in words is "twenty-one billion, two hundred seventy-four million, one hundred thirty-four thousand, seven hundred forty".