21277323 has 40 divisors (see below), whose sum is σ = 34011648. Its totient is φ = 13279464.

The previous prime is 21277301. The next prime is 21277337. The reversal of 21277323 is 32377212.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-21277323 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21277343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 452686 + ... + 452732.

Almost surely, 2^21277323 is an apocalyptic number.

21277323 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21277323 is a deficient number, since it is larger than the sum of its proper divisors (12734325).

21277323 is an frugal number, since it uses more digits than its factorization.

21277323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97 (or 73 counting only the distinct ones).

The product of its digits is 3528, while the sum is 27.

The square root of 21277323 is about 4612.7348720688. The cubic root of 21277323 is about 277.1015757840.

The spelling of 21277323 in words is "twenty-one million, two hundred seventy-seven thousand, three hundred twenty-three".