211212211220121 has 32 divisors (see below), whose sum is σ = 291591710669952. Its totient is φ = 135920571171840.

The previous prime is 211212211220107. The next prime is 211212211220173. The reversal of 211212211220121 is 121022112212112.

It is not a de Polignac number, because 211212211220121 - 2⁶ = 211212211220057 is a prime.

It is a super-2 number, since 2×211212211220121² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211212211220191) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30024010 + ... + 36384963.

It is an arithmetic number, because the mean of its divisors is an integer number (9112240958436).

Almost surely, 2^{211212211220121} is an apocalyptic number.

It is an amenable number.

211212211220121 is a deficient number, since it is larger than the sum of its proper divisors (80379499449831).

211212211220121 is a wasteful number, since it uses less digits than its factorization.

211212211220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66409353.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 211212211220121 its reverse (121022112212112), we get a palindrome (332234323432233).

The spelling of 211212211220121 in words is "two hundred eleven trillion, two hundred twelve billion, two hundred eleven million, two hundred twenty thousand, one hundred twenty-one".