21719093 has 8 divisors (see below), whose sum is σ = 23750496. Its totient is φ = 19697200.

The previous prime is 21719069. The next prime is 21719099. The reversal of 21719093 is 39091712.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21719093 - 2²² = 17524789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21719099) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2930 + ... + 7212.

It is an arithmetic number, because the mean of its divisors is an integer number (2968812).

Almost surely, 2^21719093 is an apocalyptic number.

It is an amenable number.

21719093 is a deficient number, since it is larger than the sum of its proper divisors (2031403).

21719093 is a wasteful number, since it uses less digits than its factorization.

21719093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4755.

The product of its (nonzero) digits is 3402, while the sum is 32.

The square root of 21719093 is about 4660.3747703377. The cubic root of 21719093 is about 279.0062262285.

The spelling of 21719093 in words is "twenty-one million, seven hundred nineteen thousand, ninety-three".