21465142 has 4 divisors (see below), whose sum is σ = 32197716. Its totient is φ = 10732570.

The previous prime is 21465137. The next prime is 21465149. The reversal of 21465142 is 24156412.

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 (21465149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5366284 + ... + 5366287.

It is an arithmetic number, because the mean of its divisors is an integer number (8049429).

Almost surely, 2^21465142 is an apocalyptic number.

21465142 is a deficient number, since it is larger than the sum of its proper divisors (10732574).

21465142 is a wasteful number, since it uses less digits than its factorization.

21465142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10732573.

The product of its digits is 1920, while the sum is 25.

The square root of 21465142 is about 4633.0488881513. The cubic root of 21465142 is about 277.9145312887.

It can be divided in two parts, 214 and 65142, that added together give a palindrome (65356).

The spelling of 21465142 in words is "twenty-one million, four hundred sixty-five thousand, one hundred forty-two".