21923671 has 8 divisors (see below), whose sum is σ = 27333504. Its totient is φ = 17083320.

The previous prime is 21923639. The next prime is 21923683. The reversal of 21923671 is 17632912.

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 21923671 - 2⁵ = 21923639 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21923611) 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, 142285 + ... + 142438.

It is an arithmetic number, because the mean of its divisors is an integer number (3416688).

Almost surely, 2^21923671 is an apocalyptic number.

21923671 is a deficient number, since it is larger than the sum of its proper divisors (5409833).

21923671 is a wasteful number, since it uses less digits than its factorization.

21923671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284741.

The product of its digits is 4536, while the sum is 31.

The square root of 21923671 is about 4682.2719912453. The cubic root of 21923671 is about 279.8795017223.

The spelling of 21923671 in words is "twenty-one million, nine hundred twenty-three thousand, six hundred seventy-one".