20122220121012 has 36 divisors (see below), whose sum is σ = 51205873364100. Its totient is φ = 6662390552832.

The previous prime is 20122220120881. The next prime is 20122220121037. The reversal of 20122220121012 is 21012102222102.

It is a happy number.

20122220121012 is a `hidden beast` number, since 20 + 1 + 222 + 201 + 210 + 12 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 8355371800356 + 11766848320656 = 2890566^2 + 3430284^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1875667653 + ... + 1875678380.

It is an arithmetic number, because the mean of its divisors is an integer number (1422385371225).

Almost surely, 2^{20122220121012} is an apocalyptic number.

It is an amenable number.

20122220121012 is an abundant number, since it is smaller than the sum of its proper divisors (31083653243088).

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

20122220121012 is a wasteful number, since it uses less digits than its factorization.

20122220121012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3751346192 (or 3751346187 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 20122220121012 its reverse (21012102222102), we get a palindrome (41134322343114).

The spelling of 20122220121012 in words is "twenty trillion, one hundred twenty-two billion, two hundred twenty million, one hundred twenty-one thousand, twelve".