21218122522 has 8 divisors (see below), whose sum is σ = 31827828672. Its totient is φ = 10608846300.

The previous prime is 21218122517. The next prime is 21218122621. The reversal of 21218122522 is 22522181212.

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

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, 84447 + ... + 222637.

It is an arithmetic number, because the mean of its divisors is an integer number (3978478584).

Almost surely, 2^21218122522 is an apocalyptic number.

21218122522 is a deficient number, since it is larger than the sum of its proper divisors (10609706150).

21218122522 is a wasteful number, since it uses less digits than its factorization.

21218122522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214964.

The product of its digits is 2560, while the sum is 28.

The spelling of 21218122522 in words is "twenty-one billion, two hundred eighteen million, one hundred twenty-two thousand, five hundred twenty-two".