421140542 has 4 divisors (see below), whose sum is σ = 631710816. Its totient is φ = 210570270.

The previous prime is 421140527. The next prime is 421140569. The reversal of 421140542 is 245041124.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×421140542² = 354718712232107528, which contains 22 as substring.

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 as a sum of consecutive naturals, namely, 105285134 + ... + 105285137.

It is an arithmetic number, because the mean of its divisors is an integer number (157927704).

Almost surely, 2^421140542 is an apocalyptic number.

421140542 is a deficient number, since it is larger than the sum of its proper divisors (210570274).

421140542 is a wasteful number, since it uses less digits than its factorization.

421140542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210570273.

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 421140542 is about 20521.7090418902. The cubic root of 421140542 is about 749.5645128131.

Adding to 421140542 its reverse (245041124), we get a palindrome (666181666).

The spelling of 421140542 in words is "four hundred twenty-one million, one hundred forty thousand, five hundred forty-two".