225142021 has 8 divisors (see below), whose sum is σ = 245530880. Its totient is φ = 205191792.

The previous prime is 225141989. The next prime is 225142069. The reversal of 225142021 is 120241522.

225142021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 225142021 - 2⁵ = 225141989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 225142021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225142081) 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, 108585 + ... + 110638.

It is an arithmetic number, because the mean of its divisors is an integer number (30691360).

Almost surely, 2^225142021 is an apocalyptic number.

It is an amenable number.

225142021 is a deficient number, since it is larger than the sum of its proper divisors (20388859).

225142021 is a wasteful number, since it uses less digits than its factorization.

225142021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219315.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 225142021 is about 15004.7332865333. The cubic root of 225142021 is about 608.3481430727.

Adding to 225142021 its reverse (120241522), we get a palindrome (345383543).

The spelling of 225142021 in words is "two hundred twenty-five million, one hundred forty-two thousand, twenty-one".