21394124 has 6 divisors (see below), whose sum is σ = 37439724. Its totient is φ = 10697060.

The previous prime is 21394081. The next prime is 21394127. The reversal of 21394124 is 42149312.

It is a junction number, because it is equal to n+sod(n) for n = 21394093 and 21394102.

It is not an unprimeable number, because it can be changed into a prime (21394127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2674262 + ... + 2674269.

It is an arithmetic number, because the mean of its divisors is an integer number (6239954).

Almost surely, 2^21394124 is an apocalyptic number.

It is an amenable number.

21394124 is a deficient number, since it is larger than the sum of its proper divisors (16045600).

21394124 is a wasteful number, since it uses less digits than its factorization.

21394124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5348535 (or 5348533 counting only the distinct ones).

The product of its digits is 1728, while the sum is 26.

The square root of 21394124 is about 4625.3782548025. The cubic root of 21394124 is about 277.6076967472.

The spelling of 21394124 in words is "twenty-one million, three hundred ninety-four thousand, one hundred twenty-four".