21249274 has 8 divisors (see below), whose sum is σ = 31998708. Its totient is φ = 10583040.

The previous prime is 21249253. The next prime is 21249281. The reversal of 21249274 is 47294212.

It can be written as a sum of positive squares in 2 ways, for example, as 20766249 + 483025 = 4557^2 + 695^2 .

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

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 3 ways as a sum of consecutive naturals, for example, 20157 + ... + 21184.

Almost surely, 2^21249274 is an apocalyptic number.

21249274 is a deficient number, since it is larger than the sum of its proper divisors (10749434).

21249274 is a wasteful number, since it uses less digits than its factorization.

21249274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41600.

The product of its digits is 8064, while the sum is 31.

The square root of 21249274 is about 4609.6934822177. The cubic root of 21249274 is about 276.9797584552.

The spelling of 21249274 in words is "twenty-one million, two hundred forty-nine thousand, two hundred seventy-four".