6142821221 has 2 divisors, whose sum is σ = 6142821222. Its totient is φ = 6142821220.

The previous prime is 6142821203. The next prime is 6142821229. The reversal of 6142821221 is 1221282416.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5679280321 + 463540900 = 75361^2 + 21530^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6142821221 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6142821229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3071410610 + 3071410611.

It is an arithmetic number, because the mean of its divisors is an integer number (3071410611).

Almost surely, 2^6142821221 is an apocalyptic number.

It is an amenable number.

6142821221 is a deficient number, since it is larger than the sum of its proper divisors (1).

6142821221 is an equidigital number, since it uses as much as digits as its factorization.

6142821221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3072, while the sum is 29.

The square root of 6142821221 is about 78376.1521191236. The cubic root of 6142821221 is about 1831.4256482056.

The spelling of 6142821221 in words is "six billion, one hundred forty-two million, eight hundred twenty-one thousand, two hundred twenty-one".