21311341225 has 12 divisors (see below), whose sum is σ = 26435446416. Its totient is φ = 17043019280.

The previous prime is 21311341217. The next prime is 21311341231. The reversal of 21311341225 is 52214311312.

It is not a de Polignac number, because 21311341225 - 2³ = 21311341217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21311341225.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 78847 + ... + 220996.

It is an arithmetic number, because the mean of its divisors is an integer number (2202953868).

Almost surely, 2^21311341225 is an apocalyptic number.

21311341225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21311341225 is a deficient number, since it is larger than the sum of its proper divisors (5124105191).

21311341225 is a wasteful number, since it uses less digits than its factorization.

21311341225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302696 (or 302691 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

Adding to 21311341225 its reverse (52214311312), we get a palindrome (73525652537).

The spelling of 21311341225 in words is "twenty-one billion, three hundred eleven million, three hundred forty-one thousand, two hundred twenty-five".