21378808024 has 32 divisors (see below), whose sum is σ = 45830553120. Its totient is φ = 9158582016.

The previous prime is 21378808021. The next prime is 21378808049. The reversal of 21378808024 is 42080887312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21378808021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61302 + ... + 215674.

It is an arithmetic number, because the mean of its divisors is an integer number (1432204785).

Almost surely, 2^21378808024 is an apocalyptic number.

It is an amenable number.

21378808024 is an abundant number, since it is smaller than the sum of its proper divisors (24451745096).

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

21378808024 is a wasteful number, since it uses less digits than its factorization.

21378808024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156859 (or 156855 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 43.

The spelling of 21378808024 in words is "twenty-one billion, three hundred seventy-eight million, eight hundred eight thousand, twenty-four".