221312101431 has 16 divisors (see below), whose sum is σ = 305137736064. Its totient is φ = 142597032864.

The previous prime is 221312101427. The next prime is 221312101459. The reversal of 221312101431 is 134101213122.

It is not a de Polignac number, because 221312101431 - 2² = 221312101427 is a prime.

It is a super-2 number, since 2×221312101431² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221312101398 and 221312101407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221312101471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10376661 + ... + 10397966.

It is an arithmetic number, because the mean of its divisors is an integer number (19071108504).

Almost surely, 2^221312101431 is an apocalyptic number.

221312101431 is a deficient number, since it is larger than the sum of its proper divisors (83825634633).

221312101431 is a wasteful number, since it uses less digits than its factorization.

221312101431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20774750.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 221312101431 its reverse (134101213122), we get a palindrome (355413314553).

The spelling of 221312101431 in words is "two hundred twenty-one billion, three hundred twelve million, one hundred one thousand, four hundred thirty-one".