21293274 has 8 divisors (see below), whose sum is σ = 42586560. Its totient is φ = 7097756.

The previous prime is 21293273. The next prime is 21293317. The reversal of 21293274 is 47239212.

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

21293274 is an admirable number.

It is a super-3 number, since 3×21293274³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21293273) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1774434 + ... + 1774445.

It is an arithmetic number, because the mean of its divisors is an integer number (5323320).

Almost surely, 2^21293274 is an apocalyptic number.

21293274 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21293274 is a wasteful number, since it uses less digits than its factorization.

21293274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3548884.

The product of its digits is 6048, while the sum is 30.

The square root of 21293274 is about 4614.4635657896. The cubic root of 21293274 is about 277.1708035274.

The spelling of 21293274 in words is "twenty-one million, two hundred ninety-three thousand, two hundred seventy-four".