21377521600 has 42 divisors (see below), whose sum is σ = 52602068024. Its totient is φ = 8551008000.

The previous prime is 21377521579. The next prime is 21377521609. The reversal of 21377521600 is 612577312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21377521609) 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 5 ways as a sum of consecutive naturals, for example, 6678876 + ... + 6682075.

Almost surely, 2^21377521600 is an apocalyptic number.

21377521600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21377521600 is an abundant number, since it is smaller than the sum of its proper divisors (31224546424).

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

21377521600 is a wasteful number, since it uses less digits than its factorization.

21377521600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13360973 (or 13360958 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 34.

The spelling of 21377521600 in words is "twenty-one billion, three hundred seventy-seven million, five hundred twenty-one thousand, six hundred".