21013194 has 16 divisors (see below), whose sum is σ = 42295968. Its totient is φ = 6959472.

The previous prime is 21013189. The next prime is 21013217. The reversal of 21013194 is 49131012.

It is a self number, because there is not a number n which added to its sum of digits gives 21013194.

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, 10212 + ... + 12095.

It is an arithmetic number, because the mean of its divisors is an integer number (2643498).

Almost surely, 2^21013194 is an apocalyptic number.

21013194 is an abundant number, since it is smaller than the sum of its proper divisors (21282774).

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

21013194 is a wasteful number, since it uses less digits than its factorization.

21013194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22469.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 21013194 is about 4584.0150523313. The cubic root of 21013194 is about 275.9501852965.

The spelling of 21013194 in words is "twenty-one million, thirteen thousand, one hundred ninety-four".