265135123531021 has 4 divisors (see below), whose sum is σ = 268329522609792. Its totient is φ = 261940724452252.

The previous prime is 265135123531007. The next prime is 265135123531049. The reversal of 265135123531021 is 120135321531562.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-265135123531021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (265135123501021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1597199539261 + ... + 1597199539426.

It is an arithmetic number, because the mean of its divisors is an integer number (67082380652448).

Almost surely, 2^{265135123531021} is an apocalyptic number.

It is an amenable number.

265135123531021 is a deficient number, since it is larger than the sum of its proper divisors (3194399078771).

265135123531021 is an equidigital number, since it uses as much as digits as its factorization.

265135123531021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3194399078770.

The product of its (nonzero) digits is 162000, while the sum is 40.

The spelling of 265135123531021 in words is "two hundred sixty-five trillion, one hundred thirty-five billion, one hundred twenty-three million, five hundred thirty-one thousand, twenty-one".