202110122111221 has 16 divisors (see below), whose sum is σ = 214027411046400. Its totient is φ = 190320888629808.

The previous prime is 202110122111143. The next prime is 202110122111273. The reversal of 202110122111221 is 122111221011202.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 202110122111221 - 2¹⁵ = 202110122078453 is a prime.

It is a super-2 number, since 2×202110122111221² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202110122111281) 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, 115130556 + ... + 116872858.

It is an arithmetic number, because the mean of its divisors is an integer number (13376713190400).

Almost surely, 2^{202110122111221} is an apocalyptic number.

It is an amenable number.

202110122111221 is a deficient number, since it is larger than the sum of its proper divisors (11917288935179).

202110122111221 is a wasteful number, since it uses less digits than its factorization.

202110122111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1779048.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 202110122111221 its reverse (122111221011202), we get a palindrome (324221343122423).

The spelling of 202110122111221 in words is "two hundred two trillion, one hundred ten billion, one hundred twenty-two million, one hundred eleven thousand, two hundred twenty-one".