23211121981 has 8 divisors (see below), whose sum is σ = 24776884800. Its totient is φ = 21679771680.

The previous prime is 23211121979. The next prime is 23211121987. The reversal of 23211121981 is 18912111232.

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

It is a cyclic number.

It is not a de Polignac number, because 23211121981 - 2¹ = 23211121979 is a prime.

It is a super-2 number, since 2×23211121981² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23211121987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8601736 + ... + 8604433.

It is an arithmetic number, because the mean of its divisors is an integer number (3097110600).

Almost surely, 2^23211121981 is an apocalyptic number.

It is an amenable number.

23211121981 is a deficient number, since it is larger than the sum of its proper divisors (1565762819).

23211121981 is a wasteful number, since it uses less digits than its factorization.

23211121981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17206259.

The product of its digits is 1728, while the sum is 31.

The spelling of 23211121981 in words is "twenty-three billion, two hundred eleven million, one hundred twenty-one thousand, nine hundred eighty-one".