21034974540 has 48 divisors (see below), whose sum is σ = 58904223840. Its totient is φ = 5608727040.

The previous prime is 21034974523. The next prime is 21034974547. The reversal of 21034974540 is 4547943012.

It is not an unprimeable number, because it can be changed into a prime (21034974547) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1075650 + ... + 1095030.

It is an arithmetic number, because the mean of its divisors is an integer number (1227171330).

Almost surely, 2^21034974540 is an apocalyptic number.

21034974540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21034974540 is an abundant number, since it is smaller than the sum of its proper divisors (37869249300).

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

21034974540 is a wasteful number, since it uses less digits than its factorization.

21034974540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37482 (or 37480 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 39.

The spelling of 21034974540 in words is "twenty-one billion, thirty-four million, nine hundred seventy-four thousand, five hundred forty".