21211422018 has 32 divisors (see below), whose sum is σ = 42996096000. Its totient is φ = 6975490176.

The previous prime is 21211422007. The next prime is 21211422041. The reversal of 21211422018 is 81022411212.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82783 + ... + 221981.

It is an arithmetic number, because the mean of its divisors is an integer number (1343628000).

Almost surely, 2^21211422018 is an apocalyptic number.

21211422018 is an abundant number, since it is smaller than the sum of its proper divisors (21784673982).

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

21211422018 is a wasteful number, since it uses less digits than its factorization.

21211422018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139546.

The product of its (nonzero) digits is 512, while the sum is 24.

The spelling of 21211422018 in words is "twenty-one billion, two hundred eleven million, four hundred twenty-two thousand, eighteen".