21977753 has 8 divisors (see below), whose sum is σ = 26595072. Its totient is φ = 17729856.

The previous prime is 21977743. The next prime is 21977771. The reversal of 21977753 is 35777912.

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 21977753 - 2¹⁴ = 21961369 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21977753.

It is not an unprimeable number, because it can be changed into a prime (21977713) 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, 92225 + ... + 92462.

It is an arithmetic number, because the mean of its divisors is an integer number (3324384).

Almost surely, 2^21977753 is an apocalyptic number.

It is an amenable number.

21977753 is a deficient number, since it is larger than the sum of its proper divisors (4617319).

21977753 is a wasteful number, since it uses less digits than its factorization.

21977753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184711.

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

The square root of 21977753 is about 4688.0436218107. The cubic root of 21977753 is about 280.1094512578.

The spelling of 21977753 in words is "twenty-one million, nine hundred seventy-seven thousand, seven hundred fifty-three".