540542021 has 8 divisors (see below), whose sum is σ = 564279360. Its totient is φ = 516824352.

The previous prime is 540542003. The next prime is 540542027. The reversal of 540542021 is 120245045.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-540542021 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (540542027) 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, 92690 + ... + 98348.

It is an arithmetic number, because the mean of its divisors is an integer number (70534920).

Almost surely, 2^540542021 is an apocalyptic number.

It is an amenable number.

540542021 is a deficient number, since it is larger than the sum of its proper divisors (23737339).

540542021 is a wasteful number, since it uses less digits than its factorization.

540542021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9835.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 540542021 is about 23249.5595872266. The cubic root of 540542021 is about 814.5976515277.

Adding to 540542021 its reverse (120245045), we get a palindrome (660787066).

The spelling of 540542021 in words is "five hundred forty million, five hundred forty-two thousand, twenty-one".