20521516635325 has 24 divisors (see below), whose sum is σ = 25563204350208. Its totient is φ = 16342050622080.

The previous prime is 20521516635283. The next prime is 20521516635377. The reversal of 20521516635325 is 52353661512502.

It is not a de Polignac number, because 20521516635325 - 2¹³ = 20521516627133 is a prime.

It is a super-2 number, since 2×20521516635325² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60805494 + ... + 61142056.

It is an arithmetic number, because the mean of its divisors is an integer number (1065133514592).

Almost surely, 2^{20521516635325} is an apocalyptic number.

20521516635325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20521516635325 is a deficient number, since it is larger than the sum of its proper divisors (5041687714883).

20521516635325 is a wasteful number, since it uses less digits than its factorization.

20521516635325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347733 (or 347728 counting only the distinct ones).

The product of its (nonzero) digits is 1620000, while the sum is 46.

The spelling of 20521516635325 in words is "twenty trillion, five hundred twenty-one billion, five hundred sixteen million, six hundred thirty-five thousand, three hundred twenty-five".