20013221101554 has 24 divisors (see below), whose sum is σ = 43375872792252. Its totient is φ = 6668936202240.

The previous prime is 20013221101537. The next prime is 20013221101567. The reversal of 20013221101554 is 45510112231002.

It is a happy number.

20013221101554 is a `hidden beast` number, since 2 + 0 + 0 + 1 + 3 + 2 + 2 + 1 + 101 + 554 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 19189419808329 + 823801293225 = 4380573^2 + 907635^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 178067119 + ... + 178179474.

Almost surely, 2^{20013221101554} is an apocalyptic number.

20013221101554 is an abundant number, since it is smaller than the sum of its proper divisors (23362651690698).

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

20013221101554 is a wasteful number, since it uses less digits than its factorization.

20013221101554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356249722 (or 356249719 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

Adding to 20013221101554 its reverse (45510112231002), we get a palindrome (65523333332556).

The spelling of 20013221101554 in words is "twenty trillion, thirteen billion, two hundred twenty-one million, one hundred one thousand, five hundred fifty-four".