21315194 has 8 divisors (see below), whose sum is σ = 32423328. Its totient is φ = 10507420.

The previous prime is 21315187. The next prime is 21315211. The reversal of 21315194 is 49151312.

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, 74912 + ... + 75195.

It is an arithmetic number, because the mean of its divisors is an integer number (4052916).

Almost surely, 2^21315194 is an apocalyptic number.

21315194 is a deficient number, since it is larger than the sum of its proper divisors (11108134).

21315194 is a wasteful number, since it uses less digits than its factorization.

21315194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150180.

The product of its digits is 1080, while the sum is 26.

The square root of 21315194 is about 4616.8380954935. The cubic root of 21315194 is about 277.2658805049.

The spelling of 21315194 in words is "twenty-one million, three hundred fifteen thousand, one hundred ninety-four".