542510021 has 16 divisors (see below), whose sum is σ = 590136960. Its totient is φ = 496964160.

The previous prime is 542509987. The next prime is 542510029. The reversal of 542510021 is 120015245.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-542510021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 542509975 and 542510002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (542510029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115091 + ... + 119711.

It is an arithmetic number, because the mean of its divisors is an integer number (36883560).

Almost surely, 2^542510021 is an apocalyptic number.

It is an amenable number.

542510021 is a deficient number, since it is larger than the sum of its proper divisors (47626939).

542510021 is a wasteful number, since it uses less digits than its factorization.

542510021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4844.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 542510021 is about 23291.8445169119. The cubic root of 542510021 is about 815.5850471977.

Adding to 542510021 its reverse (120015245), we get a palindrome (662525266).

The spelling of 542510021 in words is "five hundred forty-two million, five hundred ten thousand, twenty-one".