31212213425 has 18 divisors (see below), whose sum is σ = 40847374998. Its totient is φ = 23655565440.

The previous prime is 31212213421. The next prime is 31212213427. The reversal of 31212213425 is 52431221213.

It can be written as a sum of positive squares in 3 ways, for example, as 7532851264 + 23679362161 = 86792^2 + 153881^2 .

It is not a de Polignac number, because 31212213425 - 2² = 31212213421 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31212213394 and 31212213403.

It is not an unprimeable number, because it can be changed into a prime (31212213421) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1720184 + ... + 1738233.

It is an arithmetic number, because the mean of its divisors is an integer number (2269298611).

Almost surely, 2^31212213425 is an apocalyptic number.

It is an amenable number.

31212213425 is a deficient number, since it is larger than the sum of its proper divisors (9635161573).

31212213425 is a wasteful number, since it uses less digits than its factorization.

31212213425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3458465 (or 3458441 counting only the distinct ones).

The product of its digits is 2880, while the sum is 26.

Adding to 31212213425 its reverse (52431221213), we get a palindrome (83643434638).

The spelling of 31212213425 in words is "thirty-one billion, two hundred twelve million, two hundred thirteen thousand, four hundred twenty-five".