12542212021 has 2 divisors, whose sum is σ = 12542212022. Its totient is φ = 12542212020.

The previous prime is 12542212003. The next prime is 12542212027. The reversal of 12542212021 is 12021224521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9080184100 + 3462027921 = 95290^2 + 58839^2 .

It is a cyclic number.

It is not a de Polignac number, because 12542212021 - 2⁵ = 12542211989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12542211983 and 12542212001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12542212027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6271106010 + 6271106011.

It is an arithmetic number, because the mean of its divisors is an integer number (6271106011).

Almost surely, 2^12542212021 is an apocalyptic number.

It is an amenable number.

12542212021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12542212021 is an equidigital number, since it uses as much as digits as its factorization.

12542212021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 640, while the sum is 22.

Adding to 12542212021 its reverse (12021224521), we get a palindrome (24563436542).

The spelling of 12542212021 in words is "twelve billion, five hundred forty-two million, two hundred twelve thousand, twenty-one".