2123212531 has 8 divisors (see below), whose sum is σ = 2335375728. Its totient is φ = 1930192000.

The previous prime is 2123212529. The next prime is 2123212541. The reversal of 2123212531 is 1352123212.

It is not a de Polignac number, because 2123212531 - 2¹ = 2123212529 is a prime.

It is a super-2 number, since 2×2123212531² = 9016062903590851922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2123212541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 796270 + ... + 798931.

It is an arithmetic number, because the mean of its divisors is an integer number (291921966).

Almost surely, 2^2123212531 is an apocalyptic number.

2123212531 is a deficient number, since it is larger than the sum of its proper divisors (212163197).

2123212531 is an equidigital number, since it uses as much as digits as its factorization.

2123212531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1595234 (or 1595212 counting only the distinct ones).

The product of its digits is 720, while the sum is 22.

The square root of 2123212531 is about 46078.3303842490. The cubic root of 2123212531 is about 1285.2802168648.

Adding to 2123212531 its reverse (1352123212), we get a palindrome (3475335743).

The spelling of 2123212531 in words is "two billion, one hundred twenty-three million, two hundred twelve thousand, five hundred thirty-one".