21277417 has 12 divisors (see below), whose sum is σ = 25280640. Its totient is φ = 17847816.

The previous prime is 21277411. The next prime is 21277423. The reversal of 21277417 is 71477212.

It is an interprime number because it is at equal distance from previous prime (21277411) and next prime (21277423).

It is not a de Polignac number, because 21277417 - 2³ = 21277409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21277411) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2317 + ... + 6922.

It is an arithmetic number, because the mean of its divisors is an integer number (2106720).

Almost surely, 2^21277417 is an apocalyptic number.

It is an amenable number.

21277417 is a deficient number, since it is larger than the sum of its proper divisors (4003223).

21277417 is an equidigital number, since it uses as much as digits as its factorization.

21277417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9300 (or 9293 counting only the distinct ones).

The product of its digits is 5488, while the sum is 31.

The square root of 21277417 is about 4612.7450612406. The cubic root of 21277417 is about 277.1019838477.

The spelling of 21277417 in words is "twenty-one million, two hundred seventy-seven thousand, four hundred seventeen".