215401122231 has 16 divisors (see below), whose sum is σ = 287469192960. Its totient is φ = 143466966720.

The previous prime is 215401122229. The next prime is 215401122239. The reversal of 215401122231 is 132221104512.

It is a happy number.

215401122231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 215401122231 - 2¹ = 215401122229 is a prime.

It is a super-2 number, since 2×215401122231² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215401122239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18870916 + ... + 18882326.

It is an arithmetic number, because the mean of its divisors is an integer number (17966824560).

Almost surely, 2^215401122231 is an apocalyptic number.

215401122231 is a deficient number, since it is larger than the sum of its proper divisors (72068070729).

215401122231 is a wasteful number, since it uses less digits than its factorization.

215401122231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16726.

The product of its (nonzero) digits is 960, while the sum is 24.

Adding to 215401122231 its reverse (132221104512), we get a palindrome (347622226743).

The spelling of 215401122231 in words is "two hundred fifteen billion, four hundred one million, one hundred twenty-two thousand, two hundred thirty-one".