21394522 has 4 divisors (see below), whose sum is σ = 32091786. Its totient is φ = 10697260.

The previous prime is 21394519. The next prime is 21394561. The reversal of 21394522 is 22549312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17901361 + 3493161 = 4231^2 + 1869^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5348629 + ... + 5348632.

Almost surely, 2^21394522 is an apocalyptic number.

21394522 is a deficient number, since it is larger than the sum of its proper divisors (10697264).

21394522 is a wasteful number, since it uses less digits than its factorization.

21394522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10697263.

The product of its digits is 4320, while the sum is 28.

The square root of 21394522 is about 4625.4212781108. The cubic root of 21394522 is about 277.6094182040.

The spelling of 21394522 in words is "twenty-one million, three hundred ninety-four thousand, five hundred twenty-two".