211211220010121 has 4 divisors (see below), whose sum is σ = 211346007005952. Its totient is φ = 211076433014292.

The previous prime is 211211220010097. The next prime is 211211220010123. The reversal of 211211220010121 is 121010022112112.

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 211211220010121 - 2¹⁴ = 211211219993737 is a prime.

It is a super-2 number, since 2×211211220010121² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211211220010121.

It is not an unprimeable number, because it can be changed into a prime (211211220010123) 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, 67393495565 + ... + 67393498698.

It is an arithmetic number, because the mean of its divisors is an integer number (52836501751488).

Almost surely, 2^{211211220010121} is an apocalyptic number.

It is an amenable number.

211211220010121 is a deficient number, since it is larger than the sum of its proper divisors (134786995831).

211211220010121 is a wasteful number, since it uses less digits than its factorization.

211211220010121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134786995830.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 211211220010121 its reverse (121010022112112), we get a palindrome (332221242122233).

The spelling of 211211220010121 in words is "two hundred eleven trillion, two hundred eleven billion, two hundred twenty million, ten thousand, one hundred twenty-one".