21996373 has 8 divisors (see below), whose sum is σ = 25238592. Its totient is φ = 18779136.

The previous prime is 21996353. The next prime is 21996383. The reversal of 21996373 is 37369912.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21996373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21996323) 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, 4315 + ... + 7912.

It is an arithmetic number, because the mean of its divisors is an integer number (3154824).

Almost surely, 2^21996373 is an apocalyptic number.

It is an amenable number.

21996373 is a deficient number, since it is larger than the sum of its proper divisors (3242219).

21996373 is a wasteful number, since it uses less digits than its factorization.

21996373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12491.

The product of its digits is 61236, while the sum is 40.

The square root of 21996373 is about 4690.0291043873. The cubic root of 21996373 is about 280.1885337395.

The spelling of 21996373 in words is "twenty-one million, nine hundred ninety-six thousand, three hundred seventy-three".