21550031342224 has 80 divisors (see below), whose sum is σ = 52258472850816. Its totient is φ = 8363446272000.

The previous prime is 21550031342221. The next prime is 21550031342227. The reversal of 21550031342224 is 42224313005512.

It is an interprime number because it is at equal distance from previous prime (21550031342221) and next prime (21550031342227).

It is a self number, because there is not a number n which added to its sum of digits gives 21550031342224.

It is not an unprimeable number, because it can be changed into a prime (21550031342221) 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, 33714327 + ... + 34347574.

Almost surely, 2^{21550031342224} is an apocalyptic number.

It is an amenable number.

21550031342224 is an abundant number, since it is smaller than the sum of its proper divisors (30708441508592).

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

21550031342224 is a wasteful number, since it uses less digits than its factorization.

21550031342224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68062184 (or 68062178 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 34.

Adding to 21550031342224 its reverse (42224313005512), we get a palindrome (63774344347736).

The spelling of 21550031342224 in words is "twenty-one trillion, five hundred fifty billion, thirty-one million, three hundred forty-two thousand, two hundred twenty-four".