21877323 has 16 divisors (see below), whose sum is σ = 32264736. Its totient is φ = 13098240.

The previous prime is 21877321. The next prime is 21877363. The reversal of 21877323 is 32377812.

It is not a de Polignac number, because 21877323 - 2¹ = 21877321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21877321) 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 15 ways as a sum of consecutive naturals, for example, 6138 + ... + 9023.

It is an arithmetic number, because the mean of its divisors is an integer number (2016546).

Almost surely, 2^21877323 is an apocalyptic number.

21877323 is a deficient number, since it is larger than the sum of its proper divisors (10387413).

21877323 is a wasteful number, since it uses less digits than its factorization.

21877323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15214.

The product of its digits is 14112, while the sum is 33.

The square root of 21877323 is about 4677.3200660207. The cubic root of 21877323 is about 279.6821350344.

The spelling of 21877323 in words is "twenty-one million, eight hundred seventy-seven thousand, three hundred twenty-three".