21779912622 has 16 divisors (see below), whose sum is σ = 46910581200. Its totient is φ = 6701511552.

The previous prime is 21779912597. The next prime is 21779912647. The reversal of 21779912622 is 22621997712.

It is an interprime number because it is at equal distance from previous prime (21779912597) and next prime (21779912647).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139614747 + ... + 139614902.

It is an arithmetic number, because the mean of its divisors is an integer number (2931911325).

Almost surely, 2^21779912622 is an apocalyptic number.

21779912622 is an abundant number, since it is smaller than the sum of its proper divisors (25130668578).

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

21779912622 is a wasteful number, since it uses less digits than its factorization.

21779912622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279229667.

The product of its digits is 381024, while the sum is 48.

The spelling of 21779912622 in words is "twenty-one billion, seven hundred seventy-nine million, nine hundred twelve thousand, six hundred twenty-two".