21574894 has 8 divisors (see below), whose sum is σ = 35304408. Its totient is φ = 9806760.

The previous prime is 21574879. The next prime is 21574901. The reversal of 21574894 is 49847512.

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

It is a super-2 number, since 2×21574894² = 930952102222472, which contains 22 as substring.

It is a congruent number.

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, 490317 + ... + 490360.

It is an arithmetic number, because the mean of its divisors is an integer number (4413051).

Almost surely, 2^21574894 is an apocalyptic number.

21574894 is a deficient number, since it is larger than the sum of its proper divisors (13729514).

21574894 is a wasteful number, since it uses less digits than its factorization.

21574894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 980690.

The product of its digits is 80640, while the sum is 40.

The square root of 21574894 is about 4644.8782545940. The cubic root of 21574894 is about 278.3873884359.

The spelling of 21574894 in words is "twenty-one million, five hundred seventy-four thousand, eight hundred ninety-four".