2021200222121 has 16 divisors (see below), whose sum is σ = 2350675728000. Its totient is φ = 1723828854528.

The previous prime is 2021200222117. The next prime is 2021200222157. The reversal of 2021200222121 is 1212220021202.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2021200222121 - 2² = 2021200222117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2021200222121.

It is not an unprimeable number, because it can be changed into a prime (2021200222421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136027046 + ... + 136041903.

It is an arithmetic number, because the mean of its divisors is an integer number (146917233000).

Almost surely, 2^{2021200222121} is an apocalyptic number.

It is an amenable number.

2021200222121 is a deficient number, since it is larger than the sum of its proper divisors (329475505879).

2021200222121 is a wasteful number, since it uses less digits than its factorization.

2021200222121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272069008.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 2021200222121 its reverse (1212220021202), we get a palindrome (3233420243323).

The spelling of 2021200222121 in words is "two trillion, twenty-one billion, two hundred million, two hundred twenty-two thousand, one hundred twenty-one".