21146531266465 has 8 divisors (see below), whose sum is σ = 27682731839808. Its totient is φ = 15379295466480.

The previous prime is 21146531266457. The next prime is 21146531266489. The reversal of 21146531266465 is 56466213564112.

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

It is not a de Polignac number, because 21146531266465 - 2³ = 21146531266457 is a prime.

It is a Duffinian 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, 192241193277 + ... + 192241193386.

It is an arithmetic number, because the mean of its divisors is an integer number (3460341479976).

Almost surely, 2^{21146531266465} is an apocalyptic number.

It is an amenable number.

21146531266465 is a deficient number, since it is larger than the sum of its proper divisors (6536200573343).

21146531266465 is a wasteful number, since it uses less digits than its factorization.

21146531266465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384482386679.

The product of its digits is 6220800, while the sum is 52.

The spelling of 21146531266465 in words is "twenty-one trillion, one hundred forty-six billion, five hundred thirty-one million, two hundred sixty-six thousand, four hundred sixty-five".