211012122121 has 4 divisors (see below), whose sum is σ = 211013336212. Its totient is φ = 211010908032.

The previous prime is 211012122091. The next prime is 211012122133. The reversal of 211012122121 is 121221210112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 125316000000 + 85696122121 = 354000^2 + 292739^2 .

It is a cyclic number.

It is not a de Polignac number, because 211012122121 - 2¹⁷ = 211011991049 is a prime.

It is a super-2 number, since 2×211012122121² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211012122095 and 211012122104.

It is not an unprimeable number, because it can be changed into a prime (211012122521) 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, 291756 + ... + 712141.

It is an arithmetic number, because the mean of its divisors is an integer number (52753334053).

Almost surely, 2^211012122121 is an apocalyptic number.

It is an amenable number.

211012122121 is a deficient number, since it is larger than the sum of its proper divisors (1214091).

211012122121 is a wasteful number, since it uses less digits than its factorization.

211012122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1214090.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 211012122121 its reverse (121221210112), we get a palindrome (332233332233).

The spelling of 211012122121 in words is "two hundred eleven billion, twelve million, one hundred twenty-two thousand, one hundred twenty-one".