21961217883 has 8 divisors (see below), whose sum is σ = 31943589696. Its totient is φ = 13309829000.

The previous prime is 21961217881. The next prime is 21961217923. The reversal of 21961217883 is 38871216912.

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 21961217883 - 2¹ = 21961217881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21961217881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 332745693 + ... + 332745758.

It is an arithmetic number, because the mean of its divisors is an integer number (3992948712).

Almost surely, 2^21961217883 is an apocalyptic number.

21961217883 is a deficient number, since it is larger than the sum of its proper divisors (9982371813).

21961217883 is a wasteful number, since it uses less digits than its factorization.

21961217883 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 665491465.

The product of its digits is 290304, while the sum is 48.

The spelling of 21961217883 in words is "twenty-one billion, nine hundred sixty-one million, two hundred seventeen thousand, eight hundred eighty-three".