21542010504 has 32 divisors (see below), whose sum is σ = 61548601920. Its totient is φ = 6154860096.

The previous prime is 21542010419. The next prime is 21542010517. The reversal of 21542010504 is 40501024512.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64112959 + ... + 64113294.

It is an arithmetic number, because the mean of its divisors is an integer number (1923393810).

Almost surely, 2^21542010504 is an apocalyptic number.

21542010504 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21542010504 is an abundant number, since it is smaller than the sum of its proper divisors (40006591416).

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

21542010504 is a wasteful number, since it uses less digits than its factorization.

21542010504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128226269 (or 128226265 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

The spelling of 21542010504 in words is "twenty-one billion, five hundred forty-two million, ten thousand, five hundred four".