21230342 has 16 divisors (see below), whose sum is σ = 36663840. Its totient is φ = 9031488.

The previous prime is 21230329. The next prime is 21230359. The reversal of 21230342 is 24303212.

It is a self number, because there is not a number n which added to its sum of digits gives 21230342.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3617 + ... + 7452.

It is an arithmetic number, because the mean of its divisors is an integer number (2291490).

Almost surely, 2^21230342 is an apocalyptic number.

21230342 is a deficient number, since it is larger than the sum of its proper divisors (15433498).

21230342 is a wasteful number, since it uses less digits than its factorization.

21230342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11215.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 21230342 is about 4607.6395258310. The cubic root of 21230342 is about 276.8974758186.

Adding to 21230342 its reverse (24303212), we get a palindrome (45533554).

The spelling of 21230342 in words is "twenty-one million, two hundred thirty thousand, three hundred forty-two".