21162650642497 has 32 divisors (see below), whose sum is σ = 26545920307200. Its totient is φ = 16425286194240.

The previous prime is 21162650642447. The next prime is 21162650642527. The reversal of 21162650642497 is 79424605626112.

It is not a de Polignac number, because 21162650642497 - 2¹¹ = 21162650640449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21162650642447) 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, 6944023 + ... + 9515500.

It is an arithmetic number, because the mean of its divisors is an integer number (829560009600).

Almost surely, 2^{21162650642497} is an apocalyptic number.

It is an amenable number.

21162650642497 is a deficient number, since it is larger than the sum of its proper divisors (5383269664703).

21162650642497 is a wasteful number, since it uses less digits than its factorization.

21162650642497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16459813.

The product of its (nonzero) digits is 8709120, while the sum is 55.

The spelling of 21162650642497 in words is "twenty-one trillion, one hundred sixty-two billion, six hundred fifty million, six hundred forty-two thousand, four hundred ninety-seven".