21961455326 has 8 divisors (see below), whose sum is σ = 32957115840. Its totient is φ = 10975750048.

The previous prime is 21961455289. The next prime is 21961455331. The reversal of 21961455326 is 62355416912.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2483291 + ... + 2492118.

It is an arithmetic number, because the mean of its divisors is an integer number (4119639480).

Almost surely, 2^21961455326 is an apocalyptic number.

21961455326 is a deficient number, since it is larger than the sum of its proper divisors (10995660514).

21961455326 is a wasteful number, since it uses less digits than its factorization.

21961455326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4977618.

The product of its digits is 388800, while the sum is 44.

The spelling of 21961455326 in words is "twenty-one billion, nine hundred sixty-one million, four hundred fifty-five thousand, three hundred twenty-six".