21963945774 has 32 divisors (see below), whose sum is σ = 46340300160. Its totient is φ = 6920920800.

The previous prime is 21963945769. The next prime is 21963945781. The reversal of 21963945774 is 47754936912.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 156412 + ... + 261519.

It is an arithmetic number, because the mean of its divisors is an integer number (1448134380).

Almost surely, 2^21963945774 is an apocalyptic number.

21963945774 is an abundant number, since it is smaller than the sum of its proper divisors (24376354386).

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

21963945774 is a wasteful number, since it uses less digits than its factorization.

21963945774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418416.

The product of its digits is 11430720, while the sum is 57.

The spelling of 21963945774 in words is "twenty-one billion, nine hundred sixty-three million, nine hundred forty-five thousand, seven hundred seventy-four".