21452142 has 8 divisors (see below), whose sum is σ = 42904296. Its totient is φ = 7150712.

The previous prime is 21452131. The next prime is 21452149. The reversal of 21452142 is 24125412.

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

21452142 is an admirable number.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21452149) 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, 1787673 + ... + 1787684.

It is an arithmetic number, because the mean of its divisors is an integer number (5363037).

Almost surely, 2^21452142 is an apocalyptic number.

21452142 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21452142 is a wasteful number, since it uses less digits than its factorization.

21452142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3575362.

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

The square root of 21452142 is about 4631.6457118394. The cubic root of 21452142 is about 277.8584152143.

Adding to 21452142 its reverse (24125412), we get a palindrome (45577554).

The spelling of 21452142 in words is "twenty-one million, four hundred fifty-two thousand, one hundred forty-two".