21754361238 has 16 divisors (see below), whose sum is σ = 44329642416. Its totient is φ = 7114633760.

The previous prime is 21754361183. The next prime is 21754361243. The reversal of 21754361238 is 83216345712.

It is a self number, because there is not a number n which added to its sum of digits gives 21754361238.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34204653 + ... + 34205288.

It is an arithmetic number, because the mean of its divisors is an integer number (2770602651).

Almost surely, 2^21754361238 is an apocalyptic number.

21754361238 is an abundant number, since it is smaller than the sum of its proper divisors (22575281178).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21754361238 is a wasteful number, since it uses less digits than its factorization.

21754361238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68409999.

The product of its digits is 241920, while the sum is 42.

The spelling of 21754361238 in words is "twenty-one billion, seven hundred fifty-four million, three hundred sixty-one thousand, two hundred thirty-eight".