21065274 has 48 divisors (see below), whose sum is σ = 47309184. Its totient is φ = 6770400.

The previous prime is 21065273. The next prime is 21065287. The reversal of 21065274 is 47256012.

21065274 is a `hidden beast` number, since 2 + 1 + 0 + 652 + 7 + 4 = 666.

It is not an unprimeable number, because it can be changed into a prime (21065273) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 67579 + ... + 67889.

It is an arithmetic number, because the mean of its divisors is an integer number (985608).

Almost surely, 2^21065274 is an apocalyptic number.

21065274 is an abundant number, since it is smaller than the sum of its proper divisors (26243910).

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

21065274 is a wasteful number, since it uses less digits than its factorization.

21065274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443 (or 440 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 21065274 is about 4589.6921465388. The cubic root of 21065274 is about 276.1779728000.

The spelling of 21065274 in words is "twenty-one million, sixty-five thousand, two hundred seventy-four".