21453674 has 32 divisors (see below), whose sum is σ = 36771840. Its totient is φ = 9298800.

The previous prime is 21453671. The next prime is 21453683. The reversal of 21453674 is 47635412.

It is a self number, because there is not a number n which added to its sum of digits gives 21453674.

It is not an unprimeable number, because it can be changed into a prime (21453671) 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, 56417 + ... + 56795.

It is an arithmetic number, because the mean of its divisors is an integer number (1149120).

Almost surely, 2^21453674 is an apocalyptic number.

21453674 is a deficient number, since it is larger than the sum of its proper divisors (15318166).

21453674 is a wasteful number, since it uses less digits than its factorization.

21453674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506.

The product of its digits is 20160, while the sum is 32.

The square root of 21453674 is about 4631.8110928664. The cubic root of 21453674 is about 277.8650294560.

The spelling of 21453674 in words is "twenty-one million, four hundred fifty-three thousand, six hundred seventy-four".