21887953700 has 18 divisors (see below), whose sum is σ = 47496859746. Its totient is φ = 8755181440.

The previous prime is 21887953691. The next prime is 21887953733. The reversal of 21887953700 is 735978812.

It can be written as a sum of positive squares in 3 ways, for example, as 1367964196 + 20519989504 = 36986^2 + 143248^2 .

It is a Harshad number since it is a multiple of its sum of digits (50).

It is an unprimeable number.

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, 109439669 + ... + 109439868.

Almost surely, 2^21887953700 is an apocalyptic number.

21887953700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21887953700 is an abundant number, since it is smaller than the sum of its proper divisors (25608906046).

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

21887953700 is a wasteful number, since it uses less digits than its factorization.

21887953700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218879551 (or 218879544 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 50.

The spelling of 21887953700 in words is "twenty-one billion, eight hundred eighty-seven million, nine hundred fifty-three thousand, seven hundred".