21087274 has 32 divisors (see below), whose sum is σ = 35925120. Its totient is φ = 9210432.

The previous prime is 21087221. The next prime is 21087277. The reversal of 21087274 is 47278012.

It is not an unprimeable number, because it can be changed into a prime (21087277) 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, 106944 + ... + 107140.

It is an arithmetic number, because the mean of its divisors is an integer number (1122660).

Almost surely, 2^21087274 is an apocalyptic number.

21087274 is a deficient number, since it is larger than the sum of its proper divisors (14837846).

21087274 is a wasteful number, since it uses less digits than its factorization.

21087274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414.

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 21087274 is about 4592.0881960171. The cubic root of 21087274 is about 276.2740836070.

The spelling of 21087274 in words is "twenty-one million, eighty-seven thousand, two hundred seventy-four".