21868574 has 16 divisors (see below), whose sum is σ = 40373088. Its totient is φ = 8651232.

The previous prime is 21868573. The next prime is 21868589. The reversal of 21868574 is 47586812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21868571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59897 + ... + 60260.

It is an arithmetic number, because the mean of its divisors is an integer number (2523318).

Almost surely, 2^21868574 is an apocalyptic number.

21868574 is a deficient number, since it is larger than the sum of its proper divisors (18504514).

21868574 is a wasteful number, since it uses less digits than its factorization.

21868574 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120179.

The product of its digits is 107520, while the sum is 41.

The square root of 21868574 is about 4676.3847147129. The cubic root of 21868574 is about 279.6448473330.

The spelling of 21868574 in words is "twenty-one million, eight hundred sixty-eight thousand, five hundred seventy-four".