21396022 has 4 divisors (see below), whose sum is σ = 32094036. Its totient is φ = 10698010.

The previous prime is 21396019. The next prime is 21396029. The reversal of 21396022 is 22069312.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21396029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5349004 + ... + 5349007.

It is an arithmetic number, because the mean of its divisors is an integer number (8023509).

Almost surely, 2^21396022 is an apocalyptic number.

21396022 is a deficient number, since it is larger than the sum of its proper divisors (10698014).

21396022 is a wasteful number, since it uses less digits than its factorization.

21396022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10698013.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 21396022 is about 4625.5834226614. The cubic root of 21396022 is about 277.6159059145.

The spelling of 21396022 in words is "twenty-one million, three hundred ninety-six thousand, twenty-two".