21412542 has 16 divisors (see below), whose sum is σ = 43736832. Its totient is φ = 6985560.

The previous prime is 21412513. The next prime is 21412549. The reversal of 21412542 is 24521412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21412549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37684 + ... + 38247.

It is an arithmetic number, because the mean of its divisors is an integer number (2733552).

Almost surely, 2^21412542 is an apocalyptic number.

21412542 is an abundant number, since it is smaller than the sum of its proper divisors (22324290).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21412542 is a wasteful number, since it uses less digits than its factorization.

21412542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75983.

The product of its digits is 640, while the sum is 21.

The square root of 21412542 is about 4627.3687987884. The cubic root of 21412542 is about 277.6873371822.

Adding to 21412542 its reverse (24521412), we get a palindrome (45933954).

The spelling of 21412542 in words is "twenty-one million, four hundred twelve thousand, five hundred forty-two".