15501542223421 has 16 divisors (see below), whose sum is σ = 15938627973120. Its totient is φ = 15065419824000.

The previous prime is 15501542223389. The next prime is 15501542223467. The reversal of 15501542223421 is 12432224510551.

It is a cyclic number.

It is not a de Polignac number, because 15501542223421 - 2⁵ = 15501542223389 is a prime.

It is a super-2 number, since 2×15501542223421² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15501542263421) 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, 122235796 + ... + 122362546.

It is an arithmetic number, because the mean of its divisors is an integer number (996164248320).

Almost surely, 2^{15501542223421} is an apocalyptic number.

It is an amenable number.

15501542223421 is a deficient number, since it is larger than the sum of its proper divisors (437085749699).

15501542223421 is a wasteful number, since it uses less digits than its factorization.

15501542223421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130524.

The product of its (nonzero) digits is 96000, while the sum is 37.

Adding to 15501542223421 its reverse (12432224510551), we get a palindrome (27933766733972).

The spelling of 15501542223421 in words is "fifteen trillion, five hundred one billion, five hundred forty-two million, two hundred twenty-three thousand, four hundred twenty-one".