521421142 has 16 divisors (see below), whose sum is σ = 898142400. Its totient is φ = 224535240.

The previous prime is 521421137. The next prime is 521421169. The reversal of 521421142 is 241124125.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 623292 + ... + 624127.

It is an arithmetic number, because the mean of its divisors is an integer number (56133900).

Almost surely, 2^521421142 is an apocalyptic number.

521421142 is a deficient number, since it is larger than the sum of its proper divisors (376721258).

521421142 is a wasteful number, since it uses less digits than its factorization.

521421142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1247451.

The product of its digits is 640, while the sum is 22.

The square root of 521421142 is about 22834.6478405076. The cubic root of 521421142 is about 804.8770523238.

Adding to 521421142 its reverse (241124125), we get a palindrome (762545267).

The spelling of 521421142 in words is "five hundred twenty-one million, four hundred twenty-one thousand, one hundred forty-two".