21440520511325 has 12 divisors (see below), whose sum is σ = 27151910232000. Its totient is φ = 16787471378160.

The previous prime is 21440520511279. The next prime is 21440520511337. The reversal of 21440520511325 is 52311502504412.

It is a de Polignac number, because none of the positive numbers 2^k-21440520511325 is a prime.

It is a congruent number.

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, 9123624575 + ... + 9123626924.

It is an arithmetic number, because the mean of its divisors is an integer number (2262659186000).

Almost surely, 2^{21440520511325} is an apocalyptic number.

21440520511325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21440520511325 is a deficient number, since it is larger than the sum of its proper divisors (5711389720675).

21440520511325 is a wasteful number, since it uses less digits than its factorization.

21440520511325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18247251556 (or 18247251551 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 35.

The spelling of 21440520511325 in words is "twenty-one trillion, four hundred forty billion, five hundred twenty million, five hundred eleven thousand, three hundred twenty-five".