21152223313655 has 128 divisors (see below), whose sum is σ = 33376512153600. Its totient is φ = 12520119435264.

The previous prime is 21152223313619. The next prime is 21152223313667. The reversal of 21152223313655 is 55631332225112.

It is not a de Polignac number, because 21152223313655 - 2³⁶ = 21083503836919 is a prime.

It is a super-2 number, since 2×21152223313655² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 54738461 + ... + 55123529.

It is an arithmetic number, because the mean of its divisors is an integer number (260754001200).

Almost surely, 2^{21152223313655} is an apocalyptic number.

21152223313655 is a deficient number, since it is larger than the sum of its proper divisors (12224288839945).

21152223313655 is a wasteful number, since it uses less digits than its factorization.

21152223313655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385273.

The product of its digits is 324000, while the sum is 41.

Adding to 21152223313655 its reverse (55631332225112), we get a palindrome (76783555538767).

The spelling of 21152223313655 in words is "twenty-one trillion, one hundred fifty-two billion, two hundred twenty-three million, three hundred thirteen thousand, six hundred fifty-five".