202001020121221 has 4 divisors (see below), whose sum is σ = 212632652759200. Its totient is φ = 191369387483244.

The previous prime is 202001020121189. The next prime is 202001020121249. The reversal of 202001020121221 is 122121020100202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 202001020121221 - 2⁵ = 202001020121189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202001020121195 and 202001020121204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202001020121261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5315816318961 + ... + 5315816318998.

It is an arithmetic number, because the mean of its divisors is an integer number (53158163189800).

Almost surely, 2^{202001020121221} is an apocalyptic number.

It is an amenable number.

202001020121221 is a deficient number, since it is larger than the sum of its proper divisors (10631632637979).

202001020121221 is a wasteful number, since it uses less digits than its factorization.

202001020121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10631632637978.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 202001020121221 its reverse (122121020100202), we get a palindrome (324122040221423).

The spelling of 202001020121221 in words is "two hundred two trillion, one billion, twenty million, one hundred twenty-one thousand, two hundred twenty-one".