2021122121220 has 48 divisors (see below), whose sum is σ = 6287935489920. Its totient is φ = 538965898848.

The previous prime is 2021122121171. The next prime is 2021122121233. The reversal of 2021122121220 is 221212211202.

It is a happy number.

2021122121220 is a `hidden beast` number, since 2 + 0 + 211 + 221 + 212 + 20 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 2021122121193 and 2021122121202.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1871408832 + ... + 1871409911.

It is an arithmetic number, because the mean of its divisors is an integer number (130998656040).

Almost surely, 2^{2021122121220} is an apocalyptic number.

2021122121220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2021122121220 is an abundant number, since it is smaller than the sum of its proper divisors (4266813368700).

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

2021122121220 is a wasteful number, since it uses less digits than its factorization.

2021122121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3742818761 (or 3742818753 counting only the distinct ones).

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

Adding to 2021122121220 its reverse (221212211202), we get a palindrome (2242334332422).

The spelling of 2021122121220 in words is "two trillion, twenty-one billion, one hundred twenty-two million, one hundred twenty-one thousand, two hundred twenty".