126372221 has 2 divisors, whose sum is σ = 126372222. Its totient is φ = 126372220.

The previous prime is 126372199. The next prime is 126372223. The reversal of 126372221 is 122273621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110460100 + 15912121 = 10510^2 + 3989^2 .

It is a cyclic number.

It is not a de Polignac number, because 126372221 - 2¹⁰ = 126371197 is a prime.

Together with 126372223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126372223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63186110 + 63186111.

It is an arithmetic number, because the mean of its divisors is an integer number (63186111).

Almost surely, 2^126372221 is an apocalyptic number.

It is an amenable number.

126372221 is a deficient number, since it is larger than the sum of its proper divisors (1).

126372221 is an equidigital number, since it uses as much as digits as its factorization.

126372221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 26.

The square root of 126372221 is about 11241.5399745764. The cubic root of 126372221 is about 501.8229734580.

The spelling of 126372221 in words is "one hundred twenty-six million, three hundred seventy-two thousand, two hundred twenty-one".