21018532222 has 16 divisors (see below), whose sum is σ = 33731211600. Its totient is φ = 9792930240.

The previous prime is 21018532189. The next prime is 21018532237. The reversal of 21018532222 is 22223581012.

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, 4531447 + ... + 4536082.

It is an arithmetic number, because the mean of its divisors is an integer number (2108200725).

Almost surely, 2^21018532222 is an apocalyptic number.

21018532222 is a deficient number, since it is larger than the sum of its proper divisors (12712679378).

21018532222 is a wasteful number, since it uses less digits than its factorization.

21018532222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9067611.

The product of its (nonzero) digits is 3840, while the sum is 28.

The spelling of 21018532222 in words is "twenty-one billion, eighteen million, five hundred thirty-two thousand, two hundred twenty-two".