21366124 has 24 divisors (see below), whose sum is σ = 40452048. Its totient is φ = 9816000.

The previous prime is 21366113. The next prime is 21366133. The reversal of 21366124 is 42166312.

It is a super-2 number, since 2×21366124² = 913022509566752, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12234 + ... + 13870.

It is an arithmetic number, because the mean of its divisors is an integer number (1685502).

Almost surely, 2^21366124 is an apocalyptic number.

It is an amenable number.

21366124 is a deficient number, since it is larger than the sum of its proper divisors (19085924).

21366124 is a wasteful number, since it uses less digits than its factorization.

21366124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1905 (or 1903 counting only the distinct ones).

The product of its digits is 1728, while the sum is 25.

The square root of 21366124 is about 4622.3504843315. The cubic root of 21366124 is about 277.4865356127.

The spelling of 21366124 in words is "twenty-one million, three hundred sixty-six thousand, one hundred twenty-four".