31221325021225 has 96 divisors (see below), whose sum is σ = 42130218493440. Its totient is φ = 22898394624000.

The previous prime is 31221325021219. The next prime is 31221325021231. The reversal of 31221325021225 is 52212052312213.

It is an interprime number because it is at equal distance from previous prime (31221325021219) and next prime (31221325021231).

It is not a de Polignac number, because 31221325021225 - 2³ = 31221325021217 is a prime.

It is a super-2 number, since 2×31221325021225² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 359123712 + ... + 359210638.

It is an arithmetic number, because the mean of its divisors is an integer number (438856442640).

Almost surely, 2^{31221325021225} is an apocalyptic number.

It is an amenable number.

31221325021225 is a deficient number, since it is larger than the sum of its proper divisors (10908893472215).

31221325021225 is a wasteful number, since it uses less digits than its factorization.

31221325021225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87331 (or 87326 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

Adding to 31221325021225 its reverse (52212052312213), we get a palindrome (83433377333438).

The spelling of 31221325021225 in words is "thirty-one trillion, two hundred twenty-one billion, three hundred twenty-five million, twenty-one thousand, two hundred twenty-five".