21674007 has 16 divisors (see below), whose sum is σ = 32320480. Its totient is φ = 14354496.

The previous prime is 21673999. The next prime is 21674011. The reversal of 21674007 is 70047612.

It is not a de Polignac number, because 21674007 - 2³ = 21673999 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21674047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1683 + ... + 6795.

It is an arithmetic number, because the mean of its divisors is an integer number (2020030).

Almost surely, 2^21674007 is an apocalyptic number.

21674007 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

21674007 is a deficient number, since it is larger than the sum of its proper divisors (10646473).

21674007 is a wasteful number, since it uses less digits than its factorization.

21674007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5279 (or 5273 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 21674007 is about 4655.5350927686. The cubic root of 21674007 is about 278.8130323249.

The spelling of 21674007 in words is "twenty-one million, six hundred seventy-four thousand, seven".