421523142 has 16 divisors (see below), whose sum is σ = 845709552. Its totient is φ = 140063840.

The previous prime is 421523131. The next prime is 421523147. The reversal of 421523142 is 241325124.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421523147) 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, 108909 + ... + 112712.

It is an arithmetic number, because the mean of its divisors is an integer number (52856847).

Almost surely, 2^421523142 is an apocalyptic number.

421523142 is an abundant number, since it is smaller than the sum of its proper divisors (424186410).

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

421523142 is a wasteful number, since it uses less digits than its factorization.

421523142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221943.

The product of its digits is 1920, while the sum is 24.

The square root of 421523142 is about 20531.0287613651. The cubic root of 421523142 is about 749.7914335610.

Adding to 421523142 its reverse (241325124), we get a palindrome (662848266).

The spelling of 421523142 in words is "four hundred twenty-one million, five hundred twenty-three thousand, one hundred forty-two".