21162650642553 has 32 divisors (see below), whose sum is σ = 32473834448896. Its totient is φ = 12008327251968.

The previous prime is 21162650642527. The next prime is 21162650642603. The reversal of 21162650642553 is 35524605626112.

It is not a de Polignac number, because 21162650642553 - 2¹² = 21162650638457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21162650642053) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1265676 + ... + 6627762.

It is an arithmetic number, because the mean of its divisors is an integer number (1014807326528).

Almost surely, 2^{21162650642553} is an apocalyptic number.

It is an amenable number.

21162650642553 is a deficient number, since it is larger than the sum of its proper divisors (11311183806343).

21162650642553 is a wasteful number, since it uses less digits than its factorization.

21162650642553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5363413.

The product of its (nonzero) digits is 2592000, while the sum is 48.

The spelling of 21162650642553 in words is "twenty-one trillion, one hundred sixty-two billion, six hundred fifty million, six hundred forty-two thousand, five hundred fifty-three".