2120256531 has 12 divisors (see below), whose sum is σ = 3223782120. Its totient is φ = 1339109280.

The previous prime is 2120256529. The next prime is 2120256553. The reversal of 2120256531 is 1356520212.

It is a happy number.

2120256531 is a `hidden beast` number, since 2 + 1 + 2 + 0 + 2 + 5 + 653 + 1 = 666.

It is not a de Polignac number, because 2120256531 - 2¹ = 2120256529 is a prime.

It is a super-2 number, since 2×2120256531² = 8990975514496307922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2120256495 and 2120256504.

It is not an unprimeable number, because it can be changed into a prime (2120256581) 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, 6199410 + ... + 6199751.

It is an arithmetic number, because the mean of its divisors is an integer number (268648510).

Almost surely, 2^2120256531 is an apocalyptic number.

2120256531 is a deficient number, since it is larger than the sum of its proper divisors (1103525589).

2120256531 is a wasteful number, since it uses less digits than its factorization.

2120256531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12399186 (or 12399183 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 2120256531 is about 46046.2433972631. The cubic root of 2120256531 is about 1284.6834713213.

Adding to 2120256531 its reverse (1356520212), we get a palindrome (3476776743).

The spelling of 2120256531 in words is "two billion, one hundred twenty million, two hundred fifty-six thousand, five hundred thirty-one".