20112222221012 has 24 divisors (see below), whose sum is σ = 35514437217000. Its totient is φ = 9965551896576.

The previous prime is 20112222221011. The next prime is 20112222221071. The reversal of 20112222221012 is 21012222221102.

It can be written as a sum of positive squares in 4 ways, for example, as 2283864472516 + 17828357748496 = 1511246^2 + 4222364^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20112222221011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38708837 + ... + 39224972.

It is an arithmetic number, because the mean of its divisors is an integer number (1479768217375).

Almost surely, 2^{20112222221012} is an apocalyptic number.

It is an amenable number.

20112222221012 is a deficient number, since it is larger than the sum of its proper divisors (15402214995988).

20112222221012 is a wasteful number, since it uses less digits than its factorization.

20112222221012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77934395 (or 77934393 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 20112222221012 its reverse (21012222221102), we get a palindrome (41124444442114).

The spelling of 20112222221012 in words is "twenty trillion, one hundred twelve billion, two hundred twenty-two million, two hundred twenty-one thousand, twelve".