22121515135123 has 4 divisors (see below), whose sum is σ = 22124252615688. Its totient is φ = 22118777654560.

The previous prime is 22121515135091. The next prime is 22121515135241. The reversal of 22121515135123 is 32153151512122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 22121515135123 - 2⁵ = 22121515135091 is a prime.

It is a super-2 number, since 2×22121515135123² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22121515138123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1368728161 + ... + 1368744322.

It is an arithmetic number, because the mean of its divisors is an integer number (5531063153922).

Almost surely, 2^{22121515135123} is an apocalyptic number.

22121515135123 is a deficient number, since it is larger than the sum of its proper divisors (2737480565).

22121515135123 is an equidigital number, since it uses as much as digits as its factorization.

22121515135123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2737480564.

The product of its digits is 18000, while the sum is 34.

Adding to 22121515135123 its reverse (32153151512122), we get a palindrome (54274666647245).

The spelling of 22121515135123 in words is "twenty-two trillion, one hundred twenty-one billion, five hundred fifteen million, one hundred thirty-five thousand, one hundred twenty-three".