25212215320 has 32 divisors (see below), whose sum is σ = 57021426720. Its totient is φ = 10032629760.

The previous prime is 25212215291. The next prime is 25212215333. The reversal of 25212215320 is 2351221252.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1625196 + ... + 1640635.

It is an arithmetic number, because the mean of its divisors is an integer number (1781919585).

Almost surely, 2^25212215320 is an apocalyptic number.

25212215320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25212215320 is an abundant number, since it is smaller than the sum of its proper divisors (31809211400).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25212215320 is a wasteful number, since it uses less digits than its factorization.

25212215320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3266035 (or 3266031 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 25212215320 its reverse (2351221252), we get a palindrome (27563436572).

The spelling of 25212215320 in words is "twenty-five billion, two hundred twelve million, two hundred fifteen thousand, three hundred twenty".