202121010121 has 16 divisors (see below), whose sum is σ = 206840874240. Its totient is φ = 197459683200.

The previous prime is 202121010061. The next prime is 202121010127. The reversal of 202121010121 is 121010121202.

It is not a de Polignac number, because 202121010121 - 2¹⁵ = 202120977353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (202121010127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7230271 + ... + 7258171.

It is an arithmetic number, because the mean of its divisors is an integer number (12927554640).

Almost surely, 2^202121010121 is an apocalyptic number.

It is an amenable number.

202121010121 is a deficient number, since it is larger than the sum of its proper divisors (4719864119).

202121010121 is a wasteful number, since it uses less digits than its factorization.

202121010121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28944.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 202121010121 its reverse (121010121202), we get a palindrome (323131131323).

It can be divided in two parts, 202 and 121010121, that multiplied together give a palindrome (24444044442).

The spelling of 202121010121 in words is "two hundred two billion, one hundred twenty-one million, ten thousand, one hundred twenty-one".