21722061716 has 12 divisors (see below), whose sum is σ = 38040145332. Its totient is φ = 10853448768.

The previous prime is 21722061689. The next prime is 21722061727. The reversal of 21722061716 is 61716022712.

It can be written as a sum of positive squares in 2 ways, for example, as 18660652816 + 3061408900 = 136604^2 + 55330^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1889075 + ... + 1900538.

It is an arithmetic number, because the mean of its divisors is an integer number (3170012111).

Almost surely, 2^21722061716 is an apocalyptic number.

It is an amenable number.

21722061716 is a deficient number, since it is larger than the sum of its proper divisors (16318083616).

21722061716 is a wasteful number, since it uses less digits than its factorization.

21722061716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3791050 (or 3791048 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 35.

The spelling of 21722061716 in words is "twenty-one billion, seven hundred twenty-two million, sixty-one thousand, seven hundred sixteen".