21968233266 has 128 divisors (see below), whose sum is σ = 52447150080. Its totient is φ = 6002740800.

The previous prime is 21968233253. The next prime is 21968233277. The reversal of 21968233266 is 66233286912.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 70637251 + ... + 70637561.

It is an arithmetic number, because the mean of its divisors is an integer number (409743360).

Almost surely, 2^21968233266 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21968233266, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26223575040).

21968233266 is an abundant number, since it is smaller than the sum of its proper divisors (30478916814).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21968233266 is a wasteful number, since it uses less digits than its factorization.

21968233266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820.

The product of its digits is 1119744, while the sum is 48.

The spelling of 21968233266 in words is "twenty-one billion, nine hundred sixty-eight million, two hundred thirty-three thousand, two hundred sixty-six".