542435021 has 2 divisors, whose sum is σ = 542435022. Its totient is φ = 542435020.

The previous prime is 542435017. The next prime is 542435027. The reversal of 542435021 is 120534245.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 331749796 + 210685225 = 18214^2 + 14515^2 .

It is a cyclic number.

It is not a de Polignac number, because 542435021 - 2² = 542435017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (542435027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 271217510 + 271217511.

It is an arithmetic number, because the mean of its divisors is an integer number (271217511).

Almost surely, 2^542435021 is an apocalyptic number.

It is an amenable number.

542435021 is a deficient number, since it is larger than the sum of its proper divisors (1).

542435021 is an equidigital number, since it uses as much as digits as its factorization.

542435021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 542435021 is about 23290.2344556683. The cubic root of 542435021 is about 815.5474615954.

Adding to 542435021 its reverse (120534245), we get a palindrome (662969266).

The spelling of 542435021 in words is "five hundred forty-two million, four hundred thirty-five thousand, twenty-one".