2101312131 has 32 divisors (see below), whose sum is σ = 3038031360. Its totient is φ = 1287922944.

The previous prime is 2101312127. The next prime is 2101312133. The reversal of 2101312131 is 1312131012.

It is a happy number.

It is not a de Polignac number, because 2101312131 - 2² = 2101312127 is a prime.

It is a super-2 number, since 2×2101312131² = 8831025343775522322, 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 2101312131.

It is not an unprimeable number, because it can be changed into a prime (2101312133) 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, 463980 + ... + 468486.

It is an arithmetic number, because the mean of its divisors is an integer number (94938480).

Almost surely, 2^2101312131 is an apocalyptic number.

2101312131 is a deficient number, since it is larger than the sum of its proper divisors (936719229).

2101312131 is a wasteful number, since it uses less digits than its factorization.

2101312131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4795.

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

The square root of 2101312131 is about 45840.0712368556. The cubic root of 2101312131 is about 1280.8458217780.

Adding to 2101312131 its reverse (1312131012), we get a palindrome (3413443143).

The spelling of 2101312131 in words is "two billion, one hundred one million, three hundred twelve thousand, one hundred thirty-one".