211215431121 has 32 divisors (see below), whose sum is σ = 296606016000. Its totient is φ = 133550085120.

The previous prime is 211215431113. The next prime is 211215431143. The reversal of 211215431121 is 121134512112.

It is a happy number.

It is not a de Polignac number, because 211215431121 - 2³ = 211215431113 is a prime.

It is a super-2 number, since 2×211215431121² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211215431091 and 211215431100.

It is not an unprimeable number, because it can be changed into a prime (211215431101) 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, 738765 + ... + 983973.

It is an arithmetic number, because the mean of its divisors is an integer number (9268938000).

Almost surely, 2^211215431121 is an apocalyptic number.

It is an amenable number.

211215431121 is a deficient number, since it is larger than the sum of its proper divisors (85390584879).

211215431121 is a wasteful number, since it uses less digits than its factorization.

211215431121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245449.

The product of its digits is 480, while the sum is 24.

Adding to 211215431121 its reverse (121134512112), we get a palindrome (332349943233).

The spelling of 211215431121 in words is "two hundred eleven billion, two hundred fifteen million, four hundred thirty-one thousand, one hundred twenty-one".