21972383 has 8 divisors (see below), whose sum is σ = 23305056. Its totient is φ = 20671200.

The previous prime is 21972373. The next prime is 21972407. The reversal of 21972383 is 38327912.

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 21972383 - 2⁶ = 21972319 is a prime.

It is a super-2 number, since 2×21972383² = 965571229397378, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21972323) 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, 6428 + ... + 9233.

It is an arithmetic number, because the mean of its divisors is an integer number (2913132).

Almost surely, 2^21972383 is an apocalyptic number.

21972383 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21972383 is a deficient number, since it is larger than the sum of its proper divisors (1332673).

21972383 is a wasteful number, since it uses less digits than its factorization.

21972383 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15745.

The product of its digits is 18144, while the sum is 35.

The square root of 21972383 is about 4687.4708532427. The cubic root of 21972383 is about 280.0866356060.

The spelling of 21972383 in words is "twenty-one million, nine hundred seventy-two thousand, three hundred eighty-three".