542401021 has 8 divisors (see below), whose sum is σ = 551441088. Its totient is φ = 533400000.

The previous prime is 542401003. The next prime is 542401033. The reversal of 542401021 is 120104245.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-542401021 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 542401021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (542401051) 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, 18946 + ... + 37996.

It is an arithmetic number, because the mean of its divisors is an integer number (68930136).

Almost surely, 2^542401021 is an apocalyptic number.

It is an amenable number.

542401021 is a deficient number, since it is larger than the sum of its proper divisors (9040067).

542401021 is a wasteful number, since it uses less digits than its factorization.

542401021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19523.

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

The square root of 542401021 is about 23289.5045245707. The cubic root of 542401021 is about 815.5304216478.

Adding to 542401021 its reverse (120104245), we get a palindrome (662505266).

The spelling of 542401021 in words is "five hundred forty-two million, four hundred one thousand, twenty-one".