542220800921 has 2 divisors, whose sum is σ = 542220800922. Its totient is φ = 542220800920.

The previous prime is 542220800833. The next prime is 542220800977. The reversal of 542220800921 is 129008022245.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 520966368400 + 21254432521 = 721780^2 + 145789^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-542220800921 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (542220800221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 271110400460 + 271110400461.

It is an arithmetic number, because the mean of its divisors is an integer number (271110400461).

Almost surely, 2^542220800921 is an apocalyptic number.

It is an amenable number.

542220800921 is a deficient number, since it is larger than the sum of its proper divisors (1).

542220800921 is an equidigital number, since it uses as much as digits as its factorization.

542220800921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23040, while the sum is 35.

The spelling of 542220800921 in words is "five hundred forty-two billion, two hundred twenty million, eight hundred thousand, nine hundred twenty-one".