21325142 has 4 divisors (see below), whose sum is σ = 31987716. Its totient is φ = 10662570.

The previous prime is 21325099. The next prime is 21325147. The reversal of 21325142 is 24152312.

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 (21325147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5331284 + ... + 5331287.

It is an arithmetic number, because the mean of its divisors is an integer number (7996929).

Almost surely, 2^21325142 is an apocalyptic number.

21325142 is a deficient number, since it is larger than the sum of its proper divisors (10662574).

21325142 is a wasteful number, since it uses less digits than its factorization.

21325142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10662573.

The product of its digits is 480, while the sum is 20.

The square root of 21325142 is about 4617.9153305361. The cubic root of 21325142 is about 277.3090079878.

Adding to 21325142 its reverse (24152312), we get a palindrome (45477454).

The spelling of 21325142 in words is "twenty-one million, three hundred twenty-five thousand, one hundred forty-two".