20021021122122 has 12 divisors (see below), whose sum is σ = 43378879097970. Its totient is φ = 6673673707368.

The previous prime is 20021021122111. The next prime is 20021021122153. The reversal of 20021021122122 is 22122112012002.

It is a happy number.

20021021122122 is a `hidden beast` number, since 2 + 0 + 0 + 210 + 211 + 221 + 22 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19814240839761 + 206780282361 = 4451319^2 + 454731^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1112278951229 = 20021021122122 / (2 + 0 + 0 + 2 + 1 + 0 + 2 + 1 + 1 + 2 + 2 + 1 + 2 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 20021021122095 and 20021021122104.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 556139475597 + ... + 556139475632.

Almost surely, 2^{20021021122122} is an apocalyptic number.

20021021122122 is an abundant number, since it is smaller than the sum of its proper divisors (23357857975848).

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

20021021122122 is a wasteful number, since it uses less digits than its factorization.

20021021122122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1112278951237 (or 1112278951234 counting only the distinct ones).

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

Adding to 20021021122122 its reverse (22122112012002), we get a palindrome (42143133134124).

The spelling of 20021021122122 in words is "twenty trillion, twenty-one billion, twenty-one million, one hundred twenty-two thousand, one hundred twenty-two".