23111221465 has 8 divisors (see below), whose sum is σ = 27874245960. Its totient is φ = 18395123712.

The previous prime is 23111221447. The next prime is 23111221493. The reversal of 23111221465 is 56412211132.

It can be written as a sum of positive squares in 4 ways, for example, as 6131046601 + 16980174864 = 78301^2 + 130308^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23111221465 is a prime.

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, 11730600 + ... + 11732569.

It is an arithmetic number, because the mean of its divisors is an integer number (3484280745).

Almost surely, 2^23111221465 is an apocalyptic number.

It is an amenable number.

23111221465 is a deficient number, since it is larger than the sum of its proper divisors (4763024495).

23111221465 is a wasteful number, since it uses less digits than its factorization.

23111221465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23463371.

The product of its digits is 2880, while the sum is 28.

Adding to 23111221465 its reverse (56412211132), we get a palindrome (79523432597).

The spelling of 23111221465 in words is "twenty-three billion, one hundred eleven million, two hundred twenty-one thousand, four hundred sixty-five".