21430194 has 8 divisors (see below), whose sum is σ = 42860400. Its totient is φ = 7143396.

The previous prime is 21430193. The next prime is 21430229. The reversal of 21430194 is 49103412.

It is a sphenic number, since it is the product of 3 distinct primes.

21430194 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21430193) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1785844 + ... + 1785855.

It is an arithmetic number, because the mean of its divisors is an integer number (5357550).

Almost surely, 2^21430194 is an apocalyptic number.

21430194 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21430194 is a wasteful number, since it uses less digits than its factorization.

21430194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3571704.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 21430194 is about 4629.2757532901. The cubic root of 21430194 is about 277.7636225439.

The spelling of 21430194 in words is "twenty-one million, four hundred thirty thousand, one hundred ninety-four".