21222765654 has 32 divisors (see below), whose sum is σ = 44691454080. Its totient is φ = 6700133952.

The previous prime is 21222765647. The next prime is 21222765691. The reversal of 21222765654 is 45656722212.

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, 441469 + ... + 487175.

It is an arithmetic number, because the mean of its divisors is an integer number (1396607940).

Almost surely, 2^21222765654 is an apocalyptic number.

21222765654 is an abundant number, since it is smaller than the sum of its proper divisors (23468688426).

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

21222765654 is a wasteful number, since it uses less digits than its factorization.

21222765654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49804.

The product of its digits is 403200, while the sum is 42.

The spelling of 21222765654 in words is "twenty-one billion, two hundred twenty-two million, seven hundred sixty-five thousand, six hundred fifty-four".