211212032121 has 12 divisors (see below), whose sum is σ = 306046460772. Its totient is φ = 140363830176.

The previous prime is 211212032107. The next prime is 211212032123. The reversal of 211212032121 is 121230212112.

It can be written as a sum of positive squares in 2 ways, for example, as 3713561721 + 207498470400 = 60939^2 + 455520^2 .

It is not a de Polignac number, because 211212032121 - 2¹⁰ = 211212031097 is a prime.

It is a super-2 number, since 2×211212032121² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 211212032094 and 211212032103.

It is not an unprimeable number, because it can be changed into a prime (211212032123) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37012926 + ... + 37018631.

It is an arithmetic number, because the mean of its divisors is an integer number (25503871731).

Almost surely, 2^211212032121 is an apocalyptic number.

It is an amenable number.

211212032121 is a deficient number, since it is larger than the sum of its proper divisors (94834428651).

211212032121 is a wasteful number, since it uses less digits than its factorization.

211212032121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74031880 (or 74031877 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 211212032121 its reverse (121230212112), we get a palindrome (332442244233).

The spelling of 211212032121 in words is "two hundred eleven billion, two hundred twelve million, thirty-two thousand, one hundred twenty-one".