21342189 has 16 divisors (see below), whose sum is σ = 31256064. Its totient is φ = 12846000.

The previous prime is 21342179. The next prime is 21342193. The reversal of 21342189 is 98124312.

It is not a de Polignac number, because 21342189 - 2¹¹ = 21340141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21342119) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2842 + ... + 7124.

It is an arithmetic number, because the mean of its divisors is an integer number (1953504).

Almost surely, 2^21342189 is an apocalyptic number.

It is an amenable number.

21342189 is a deficient number, since it is larger than the sum of its proper divisors (9913875).

21342189 is a wasteful number, since it uses less digits than its factorization.

21342189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4448.

The product of its digits is 3456, while the sum is 30.

The square root of 21342189 is about 4619.7607080887. The cubic root of 21342189 is about 277.3828805334.

The spelling of 21342189 in words is "twenty-one million, three hundred forty-two thousand, one hundred eighty-nine".