211213131 has 16 divisors (see below), whose sum is σ = 290017824. Its totient is φ = 136629504.

The previous prime is 211213103. The next prime is 211213147. The reversal of 211213131 is 131312112.

It is a happy number.

It is not a de Polignac number, because 211213131 - 2⁹ = 211212619 is a prime.

It is a super-2 number, since 2×211213131² = 89221973413646322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 211213131.

It is not an unprimeable number, because it can be changed into a prime (211213031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41671 + ... + 46463.

It is an arithmetic number, because the mean of its divisors is an integer number (18126114).

Almost surely, 2^211213131 is an apocalyptic number.

211213131 is a deficient number, since it is larger than the sum of its proper divisors (78804693).

211213131 is a wasteful number, since it uses less digits than its factorization.

211213131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5230.

The product of its digits is 36, while the sum is 15.

The square root of 211213131 is about 14533.1734662461. The cubic root of 211213131 is about 595.5345627854.

Adding to 211213131 its reverse (131312112), we get a palindrome (342525243).

The spelling of 211213131 in words is "two hundred eleven million, two hundred thirteen thousand, one hundred thirty-one".