21115353244054 has 64 divisors (see below), whose sum is σ = 35024829235200. Its totient is φ = 9502498482048.

The previous prime is 21115353244043. The next prime is 21115353244061. The reversal of 21115353244054 is 45044235351112.

It is a junction number, because it is equal to n+sod(n) for n = 21115353243998 and 21115353244016.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 368676132 + ... + 368733400.

It is an arithmetic number, because the mean of its divisors is an integer number (547262956800).

Almost surely, 2^{21115353244054} is an apocalyptic number.

21115353244054 is a deficient number, since it is larger than the sum of its proper divisors (13909475991146).

21115353244054 is a wasteful number, since it uses less digits than its factorization.

21115353244054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60157.

The product of its (nonzero) digits is 288000, while the sum is 40.

Adding to 21115353244054 its reverse (45044235351112), we get a palindrome (66159588595166).

The spelling of 21115353244054 in words is "twenty-one trillion, one hundred fifteen billion, three hundred fifty-three million, two hundred forty-four thousand, fifty-four".