21962945779 has 4 divisors (see below), whose sum is σ = 23254883784. Its totient is φ = 20671007776.

The previous prime is 21962945777. The next prime is 21962945827. The reversal of 21962945779 is 97754926912.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21962945779 - 2¹ = 21962945777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21962945777) 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, 645968977 + ... + 645969010.

It is an arithmetic number, because the mean of its divisors is an integer number (5813720946).

Almost surely, 2^21962945779 is an apocalyptic number.

21962945779 is a deficient number, since it is larger than the sum of its proper divisors (1291938005).

21962945779 is a wasteful number, since it uses less digits than its factorization.

21962945779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1291938004.

The product of its digits is 17146080, while the sum is 61.

The spelling of 21962945779 in words is "twenty-one billion, nine hundred sixty-two million, nine hundred forty-five thousand, seven hundred seventy-nine".