21134774 has 8 divisors (see below), whose sum is σ = 33567048. Its totient is φ = 9945760.

The previous prime is 21134761. The next prime is 21134809. The reversal of 21134774 is 47743112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 310772 + ... + 310839.

It is an arithmetic number, because the mean of its divisors is an integer number (4195881).

Almost surely, 2^21134774 is an apocalyptic number.

21134774 is a deficient number, since it is larger than the sum of its proper divisors (12432274).

21134774 is a wasteful number, since it uses less digits than its factorization.

21134774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621630.

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

The square root of 21134774 is about 4597.2572257815. The cubic root of 21134774 is about 276.4813678343.

Adding to 21134774 its reverse (47743112), we get a palindrome (68877886).

The spelling of 21134774 in words is "twenty-one million, one hundred thirty-four thousand, seven hundred seventy-four".