21719394 has 32 divisors (see below), whose sum is σ = 50808000. Its totient is φ = 6858432.

The previous prime is 21719393. The next prime is 21719419. The reversal of 21719394 is 49391712.

It is not an unprimeable number, because it can be changed into a prime (21719393) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9559 + ... + 11610.

It is an arithmetic number, because the mean of its divisors is an integer number (1587750).

Almost surely, 2^21719394 is an apocalyptic number.

21719394 is an abundant number, since it is smaller than the sum of its proper divisors (29088606).

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

21719394 is a wasteful number, since it uses less digits than its factorization.

21719394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21199 (or 21193 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 21719394 is about 4660.4070637660. The cubic root of 21719394 is about 279.0075151173.

The spelling of 21719394 in words is "twenty-one million, seven hundred nineteen thousand, three hundred ninety-four".