21342886 has 8 divisors (see below), whose sum is σ = 32193720. Its totient is φ = 10611648.

The previous prime is 21342883. The next prime is 21342887. The reversal of 21342886 is 68824312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21342883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29451 + ... + 30166.

It is an arithmetic number, because the mean of its divisors is an integer number (4024215).

Almost surely, 2^21342886 is an apocalyptic number.

21342886 is a deficient number, since it is larger than the sum of its proper divisors (10850834).

21342886 is a wasteful number, since it uses less digits than its factorization.

21342886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59798.

The product of its digits is 18432, while the sum is 34.

The square root of 21342886 is about 4619.8361442804. The cubic root of 21342886 is about 277.3859001200.

The spelling of 21342886 in words is "twenty-one million, three hundred forty-two thousand, eight hundred eighty-six".