21661032235125 has 16 divisors (see below), whose sum is σ = 36043957639872. Its totient is φ = 11552550525200.

The previous prime is 21661032235079. The next prime is 21661032235159. The reversal of 21661032235125 is 52153223016612.

It is not a de Polignac number, because 21661032235125 - 2⁷ = 21661032234997 is a prime.

It is a super-2 number, since 2×21661032235125² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28881375939 + ... + 28881376688.

It is an arithmetic number, because the mean of its divisors is an integer number (2252747352492).

Almost surely, 2^{21661032235125} is an apocalyptic number.

21661032235125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21661032235125 is a deficient number, since it is larger than the sum of its proper divisors (14382925404747).

21661032235125 is an equidigital number, since it uses as much as digits as its factorization.

21661032235125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57762752645 (or 57762752635 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 39.

The spelling of 21661032235125 in words is "twenty-one trillion, six hundred sixty-one billion, thirty-two million, two hundred thirty-five thousand, one hundred twenty-five".