20210213121 has 48 divisors (see below), whose sum is σ = 31651602048. Its totient is φ = 11436768000.

The previous prime is 20210213099. The next prime is 20210213143. The reversal of 20210213121 is 12131201202.

It is an interprime number because it is at equal distance from previous prime (20210213099) and next prime (20210213143).

It is not a de Polignac number, because 20210213121 - 2¹⁰ = 20210212097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20210213121.

It is not an unprimeable number, because it can be changed into a prime (20210211121) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8278261 + ... + 8280701.

It is an arithmetic number, because the mean of its divisors is an integer number (659408376).

Almost surely, 2^20210213121 is an apocalyptic number.

20210213121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20210213121 is a deficient number, since it is larger than the sum of its proper divisors (11441388927).

20210213121 is a wasteful number, since it uses less digits than its factorization.

20210213121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2982 (or 2975 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 20210213121 its reverse (12131201202), we get a palindrome (32341414323).

The spelling of 20210213121 in words is "twenty billion, two hundred ten million, two hundred thirteen thousand, one hundred twenty-one".