21329422 has 4 divisors (see below), whose sum is σ = 31994136. Its totient is φ = 10664710.

The previous prime is 21329401. The next prime is 21329431. The reversal of 21329422 is 22492312.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5332354 + ... + 5332357.

It is an arithmetic number, because the mean of its divisors is an integer number (7998534).

Almost surely, 2^21329422 is an apocalyptic number.

21329422 is a deficient number, since it is larger than the sum of its proper divisors (10664714).

21329422 is a wasteful number, since it uses less digits than its factorization.

21329422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10664713.

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

The square root of 21329422 is about 4618.3787198540. The cubic root of 21329422 is about 277.3275589101.

The spelling of 21329422 in words is "twenty-one million, three hundred twenty-nine thousand, four hundred twenty-two".