21133274 has 16 divisors (see below), whose sum is σ = 33576768. Its totient is φ = 9954912.

The previous prime is 21133243. The next prime is 21133283. The reversal of 21133274 is 47233112.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 347 + ... + 6510.

It is an arithmetic number, because the mean of its divisors is an integer number (2098548).

Almost surely, 2^21133274 is an apocalyptic number.

21133274 is a deficient number, since it is larger than the sum of its proper divisors (12443494).

21133274 is a wasteful number, since it uses less digits than its factorization.

21133274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6949.

The product of its digits is 1008, while the sum is 23.

The square root of 21133274 is about 4597.0940821349. The cubic root of 21133274 is about 276.4748267682.

Adding to 21133274 its reverse (47233112), we get a palindrome (68366386).

The spelling of 21133274 in words is "twenty-one million, one hundred thirty-three thousand, two hundred seventy-four".