23211154661 has 4 divisors (see below), whose sum is σ = 24432794400. Its totient is φ = 21989514924.

The previous prime is 23211154649. The next prime is 23211154667. The reversal of 23211154661 is 16645111232.

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-23211154661 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 (23211154667) 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, 610819841 + ... + 610819878.

It is an arithmetic number, because the mean of its divisors is an integer number (6108198600).

Almost surely, 2^23211154661 is an apocalyptic number.

It is an amenable number.

23211154661 is a deficient number, since it is larger than the sum of its proper divisors (1221639739).

23211154661 is a wasteful number, since it uses less digits than its factorization.

23211154661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1221639738.

The product of its digits is 8640, while the sum is 32.

Adding to 23211154661 its reverse (16645111232), we get a palindrome (39856265893).

The spelling of 23211154661 in words is "twenty-three billion, two hundred eleven million, one hundred fifty-four thousand, six hundred sixty-one".