212102100131 has 4 divisors (see below), whose sum is σ = 213721200264. Its totient is φ = 210483000000.

The previous prime is 212102100061. The next prime is 212102100139. The reversal of 212102100131 is 131001201212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212102100131 is a prime.

It is a super-2 number, since 2×212102100131² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (212102100139) 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, 809549870 + ... + 809550131.

It is an arithmetic number, because the mean of its divisors is an integer number (53430300066).

Almost surely, 2^212102100131 is an apocalyptic number.

212102100131 is a deficient number, since it is larger than the sum of its proper divisors (1619100133).

212102100131 is a wasteful number, since it uses less digits than its factorization.

212102100131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1619100132.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 212102100131 its reverse (131001201212), we get a palindrome (343103301343).

The spelling of 212102100131 in words is "two hundred twelve billion, one hundred two million, one hundred thousand, one hundred thirty-one".