21137377000 has 32 divisors (see below), whose sum is σ = 49461464520. Its totient is φ = 8454950400.

The previous prime is 21137376959. The next prime is 21137377007. The reversal of 21137377000 is 77373112.

It can be written as a sum of positive squares in 4 ways, for example, as 13771961316 + 7365415684 = 117354^2 + 85822^2 .

It is not an unprimeable number, because it can be changed into a prime (21137377007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10567689 + ... + 10569688.

Almost surely, 2^21137377000 is an apocalyptic number.

21137377000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21137377000 is an abundant number, since it is smaller than the sum of its proper divisors (28324087520).

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

21137377000 is a wasteful number, since it uses less digits than its factorization.

21137377000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21137398 (or 21137384 counting only the distinct ones).

The product of its (nonzero) digits is 6174, while the sum is 31.

The spelling of 21137377000 in words is "twenty-one billion, one hundred thirty-seven million, three hundred seventy-seven thousand".