21814620500 has 24 divisors (see below), whose sum is σ = 47643132264. Its totient is φ = 8725848000.

The previous prime is 21814620437. The next prime is 21814620511. The reversal of 21814620500 is 502641812.

It can be written as a sum of positive squares in 4 ways, for example, as 573889936 + 21240730564 = 23956^2 + 145742^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21814121 + ... + 21815120.

It is an arithmetic number, because the mean of its divisors is an integer number (1985130511).

Almost surely, 2^21814620500 is an apocalyptic number.

21814620500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21814620500 is an abundant number, since it is smaller than the sum of its proper divisors (25828511764).

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

21814620500 is a wasteful number, since it uses less digits than its factorization.

21814620500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43629260 (or 43629248 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 29.

The spelling of 21814620500 in words is "twenty-one billion, eight hundred fourteen million, six hundred twenty thousand, five hundred".