202120011021 has 16 divisors (see below), whose sum is σ = 285639835968. Its totient is φ = 126689760000.

The previous prime is 202120011011. The next prime is 202120011031. The reversal of 202120011021 is 120110021202.

It is an interprime number because it is at equal distance from previous prime (202120011011) and next prime (202120011031).

It is not a de Polignac number, because 202120011021 - 2⁷ = 202120010893 is a prime.

It is a super-2 number, since 2×202120011021² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 202120010988 and 202120011006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202120011001) 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, 1991230 + ... + 2090271.

It is an arithmetic number, because the mean of its divisors is an integer number (17852489748).

Almost surely, 2^202120011021 is an apocalyptic number.

It is an amenable number.

202120011021 is a deficient number, since it is larger than the sum of its proper divisors (83519824947).

202120011021 is a wasteful number, since it uses less digits than its factorization.

202120011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4082492.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 202120011021 its reverse (120110021202), we get a palindrome (322230032223).

The spelling of 202120011021 in words is "two hundred two billion, one hundred twenty million, eleven thousand, twenty-one".