21661252325135 has 8 divisors (see below), whose sum is σ = 26026531388016. Its totient is φ = 17306982794880.

The previous prime is 21661252325087. The next prime is 21661252325183. The reversal of 21661252325135 is 53152325216612.

It is an interprime number because it is at equal distance from previous prime (21661252325087) and next prime (21661252325183).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21661252325135 - 2⁶ = 21661252325071 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 2752378826 + ... + 2752386695.

It is an arithmetic number, because the mean of its divisors is an integer number (3253316423502).

Almost surely, 2^{21661252325135} is an apocalyptic number.

21661252325135 is a deficient number, since it is larger than the sum of its proper divisors (4365279062881).

21661252325135 is an equidigital number, since it uses as much as digits as its factorization.

21661252325135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5504766313.

The product of its digits is 648000, while the sum is 44.

The spelling of 21661252325135 in words is "twenty-one trillion, six hundred sixty-one billion, two hundred fifty-two million, three hundred twenty-five thousand, one hundred thirty-five".