21356274 has 8 divisors (see below), whose sum is σ = 42712560. Its totient is φ = 7118756.

The previous prime is 21356219. The next prime is 21356287. The reversal of 21356274 is 47265312.

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

21356274 is an admirable 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, 1779684 + ... + 1779695.

It is an arithmetic number, because the mean of its divisors is an integer number (5339070).

Almost surely, 2^21356274 is an apocalyptic number.

21356274 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.

21356274 is a wasteful number, since it uses less digits than its factorization.

21356274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3559384.

The product of its digits is 10080, while the sum is 30.

The square root of 21356274 is about 4621.2848862627. The cubic root of 21356274 is about 277.4438876887.

The spelling of 21356274 in words is "twenty-one million, three hundred fifty-six thousand, two hundred seventy-four".