21977357 has 8 divisors (see below), whose sum is σ = 23880960. Its totient is φ = 20148480.

The previous prime is 21977339. The next prime is 21977363. The reversal of 21977357 is 75377912.

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 21977357 - 2⁸ = 21977101 is a prime.

It is a super-3 number, since 3×21977357³ (a number of 23 digits) contains 333 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 (21977317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18068 + ... + 19245.

It is an arithmetic number, because the mean of its divisors is an integer number (2985120).

Almost surely, 2^21977357 is an apocalyptic number.

It is an amenable number.

21977357 is a deficient number, since it is larger than the sum of its proper divisors (1903603).

21977357 is a wasteful number, since it uses less digits than its factorization.

21977357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37363.

The product of its digits is 92610, while the sum is 41.

The square root of 21977357 is about 4688.0013865186. The cubic root of 21977357 is about 280.1077688898.

The spelling of 21977357 in words is "twenty-one million, nine hundred seventy-seven thousand, three hundred fifty-seven".