21465163401655 has 16 divisors (see below), whose sum is σ = 26880067468800. Its totient is φ = 16424324786848.

The previous prime is 21465163401623. The next prime is 21465163401673. The reversal of 21465163401655 is 55610436156412.

It is a cyclic number.

It is not a de Polignac number, because 21465163401655 - 2⁵ = 21465163401623 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21465163401599 and 21465163401608.

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, 5176417 + ... + 8350186.

It is an arithmetic number, because the mean of its divisors is an integer number (1680004216800).

Almost surely, 2^{21465163401655} is an apocalyptic number.

21465163401655 is a deficient number, since it is larger than the sum of its proper divisors (5414904067145).

21465163401655 is a wasteful number, since it uses less digits than its factorization.

21465163401655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13540430.

The product of its (nonzero) digits is 2592000, while the sum is 49.

The spelling of 21465163401655 in words is "twenty-one trillion, four hundred sixty-five billion, one hundred sixty-three million, four hundred one thousand, six hundred fifty-five".