21977313 has 8 divisors (see below), whose sum is σ = 29325408. Its totient is φ = 14640384.

The previous prime is 21977299. The next prime is 21977317. The reversal of 21977313 is 31377912.

It is a happy number.

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

It is not a de Polignac number, because 21977313 - 2¹⁶ = 21911777 is a prime.

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, 4606 + ... + 8072.

It is an arithmetic number, because the mean of its divisors is an integer number (3665676).

Almost surely, 2^21977313 is an apocalyptic number.

It is an amenable number.

21977313 is a deficient number, since it is larger than the sum of its proper divisors (7348095).

21977313 is a wasteful number, since it uses less digits than its factorization.

21977313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5583.

The product of its digits is 7938, while the sum is 33.

The square root of 21977313 is about 4687.9966936848. The cubic root of 21977313 is about 280.1075819587.

The spelling of 21977313 in words is "twenty-one million, nine hundred seventy-seven thousand, three hundred thirteen".