21359274 has 16 divisors (see below), whose sum is σ = 42770208. Its totient is φ = 7111152.

The previous prime is 21359269. The next prime is 21359297. The reversal of 21359274 is 47295312.

It is a super-3 number, since 3×21359274³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5109 + ... + 8295.

It is an arithmetic number, because the mean of its divisors is an integer number (2673138).

Almost surely, 2^21359274 is an apocalyptic number.

21359274 is an abundant number, since it is smaller than the sum of its proper divisors (21410934).

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

21359274 is a wasteful number, since it uses less digits than its factorization.

21359274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4309.

The product of its digits is 15120, while the sum is 33.

The square root of 21359274 is about 4621.6094599176. The cubic root of 21359274 is about 277.4568782926.

The spelling of 21359274 in words is "twenty-one million, three hundred fifty-nine thousand, two hundred seventy-four".