21152666440020 has 24 divisors (see below), whose sum is σ = 59227466032224. Its totient is φ = 5640711050656.

The previous prime is 21152666440013. The next prime is 21152666440057. The reversal of 21152666440020 is 2004466625112.

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, 176272220274 + ... + 176272220393.

It is an arithmetic number, because the mean of its divisors is an integer number (2467811084676).

Almost surely, 2^{21152666440020} is an apocalyptic number.

21152666440020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21152666440020 is an abundant number, since it is smaller than the sum of its proper divisors (38074799592204).

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

21152666440020 is a wasteful number, since it uses less digits than its factorization.

21152666440020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352544440679 (or 352544440677 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 39.

The spelling of 21152666440020 in words is "twenty-one trillion, one hundred fifty-two billion, six hundred sixty-six million, four hundred forty thousand, twenty".