21417374 has 16 divisors (see below), whose sum is σ = 35493120. Its totient is φ = 9611160.

The previous prime is 21417371. The next prime is 21417377. The reversal of 21417374 is 47371412.

It is an interprime number because it is at equal distance from previous prime (21417371) and next prime (21417377).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21417371) 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, 4424 + ... + 7899.

It is an arithmetic number, because the mean of its divisors is an integer number (2218320).

Almost surely, 2^21417374 is an apocalyptic number.

21417374 is a deficient number, since it is larger than the sum of its proper divisors (14075746).

21417374 is a wasteful number, since it uses less digits than its factorization.

21417374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12415.

The product of its digits is 4704, while the sum is 29.

The square root of 21417374 is about 4627.8908803039. The cubic root of 21417374 is about 277.7082234505.

Adding to 21417374 its reverse (47371412), we get a palindrome (68788786).

The spelling of 21417374 in words is "twenty-one million, four hundred seventeen thousand, three hundred seventy-four".