21152210155436 has 24 divisors (see below), whose sum is σ = 38317231585920. Its totient is φ = 10204895175552.

The previous prime is 21152210155411. The next prime is 21152210155499. The reversal of 21152210155436 is 63455101225112.

It is a self number, because there is not a number n which added to its sum of digits gives 21152210155436.

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, 58001585 + ... + 58365128.

It is an arithmetic number, because the mean of its divisors is an integer number (1596551316080).

Almost surely, 2^{21152210155436} is an apocalyptic number.

It is an amenable number.

21152210155436 is a deficient number, since it is larger than the sum of its proper divisors (17165021430484).

21152210155436 is a wasteful number, since it uses less digits than its factorization.

21152210155436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116368313 (or 116368311 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 38.

The spelling of 21152210155436 in words is "twenty-one trillion, one hundred fifty-two billion, two hundred ten million, one hundred fifty-five thousand, four hundred thirty-six".