23221687540 has 48 divisors (see below), whose sum is σ = 51812989200. Its totient is φ = 8742245376.

The previous prime is 23221687513. The next prime is 23221687571. The reversal of 23221687540 is 4578612232.

It can be written as a sum of positive squares in 8 ways, for example, as 1039159696 + 22182527844 = 32236^2 + 148938^2 .

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 23221687493 and 23221687502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19905 + ... + 216424.

It is an arithmetic number, because the mean of its divisors is an integer number (1079437275).

Almost surely, 2^23221687540 is an apocalyptic number.

23221687540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23221687540 is an abundant number, since it is smaller than the sum of its proper divisors (28591301660).

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

23221687540 is a wasteful number, since it uses less digits than its factorization.

23221687540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236389 (or 236353 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 40.

The spelling of 23221687540 in words is "twenty-three billion, two hundred twenty-one million, six hundred eighty-seven thousand, five hundred forty".