21121021194 has 64 divisors (see below), whose sum is σ = 52021702656. Its totient is φ = 5567004864.

The previous prime is 21121021183. The next prime is 21121021211. The reversal of 21121021194 is 49112012112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 964879 + ... + 986525.

It is an arithmetic number, because the mean of its divisors is an integer number (812839104).

Almost surely, 2^21121021194 is an apocalyptic number.

21121021194 is an abundant number, since it is smaller than the sum of its proper divisors (30900681462).

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

21121021194 is a wasteful number, since it uses less digits than its factorization.

21121021194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23459.

The product of its (nonzero) digits is 288, while the sum is 24.

The spelling of 21121021194 in words is "twenty-one billion, one hundred twenty-one million, twenty-one thousand, one hundred ninety-four".