5142531221 has 2 divisors, whose sum is σ = 5142531222. Its totient is φ = 5142531220.

The previous prime is 5142531197. The next prime is 5142531253. The reversal of 5142531221 is 1221352415.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4870644100 + 271887121 = 69790^2 + 16489^2 .

It is a cyclic number.

It is not a de Polignac number, because 5142531221 - 2²⁶ = 5075422357 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 (5142531421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2571265610 + 2571265611.

It is an arithmetic number, because the mean of its divisors is an integer number (2571265611).

Almost surely, 2^5142531221 is an apocalyptic number.

It is an amenable number.

5142531221 is a deficient number, since it is larger than the sum of its proper divisors (1).

5142531221 is an equidigital number, since it uses as much as digits as its factorization.

5142531221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2400, while the sum is 26.

The square root of 5142531221 is about 71711.4441424798. Note that the first 3 decimals coincide. The cubic root of 5142531221 is about 1726.0722839279.

Adding to 5142531221 its reverse (1221352415), we get a palindrome (6363883636).

The spelling of 5142531221 in words is "five billion, one hundred forty-two million, five hundred thirty-one thousand, two hundred twenty-one".