542530021 has 16 divisors (see below), whose sum is σ = 606957120. Its totient is φ = 480775680.

The previous prime is 542530007. The next prime is 542530033. The reversal of 542530021 is 120035245.

It is not a de Polignac number, because 542530021 - 2¹³ = 542521829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 542529974 and 542530001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (542530091) 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, 67695 + ... + 75283.

It is an arithmetic number, because the mean of its divisors is an integer number (37934820).

Almost surely, 2^542530021 is an apocalyptic number.

It is an amenable number.

542530021 is a deficient number, since it is larger than the sum of its proper divisors (64427099).

542530021 is a wasteful number, since it uses less digits than its factorization.

542530021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7764.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 542530021 is about 23292.2738477805. The cubic root of 542530021 is about 815.5950694399.

Adding to 542530021 its reverse (120035245), we get a palindrome (662565266).

The spelling of 542530021 in words is "five hundred forty-two million, five hundred thirty thousand, twenty-one".