21222565557 has 8 divisors (see below), whose sum is σ = 28359777600. Its totient is φ = 14116865280.

The previous prime is 21222565513. The next prime is 21222565627. The reversal of 21222565557 is 75556522212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21222565557 - 2⁶ = 21222565493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222564557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7876369 + ... + 7879062.

It is an arithmetic number, because the mean of its divisors is an integer number (3544972200).

Almost surely, 2^21222565557 is an apocalyptic number.

It is an amenable number.

21222565557 is a deficient number, since it is larger than the sum of its proper divisors (7137212043).

21222565557 is a wasteful number, since it uses less digits than its factorization.

21222565557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15755883.

The product of its digits is 420000, while the sum is 42.

The spelling of 21222565557 in words is "twenty-one billion, two hundred twenty-two million, five hundred sixty-five thousand, five hundred fifty-seven".