21371837928 has 32 divisors (see below), whose sum is σ = 61062394560. Its totient is φ = 6106239360.

The previous prime is 21371837923. The next prime is 21371837951. The reversal of 21371837928 is 82973817312.

It is not an unprimeable number, because it can be changed into a prime (21371837923) 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, 63606493 + ... + 63606828.

It is an arithmetic number, because the mean of its divisors is an integer number (1908199830).

Almost surely, 2^21371837928 is an apocalyptic number.

21371837928 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21371837928 is an abundant number, since it is smaller than the sum of its proper divisors (39690556632).

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

21371837928 is a wasteful number, since it uses less digits than its factorization.

21371837928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127213337 (or 127213333 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 51.

The spelling of 21371837928 in words is "twenty-one billion, three hundred seventy-one million, eight hundred thirty-seven thousand, nine hundred twenty-eight".