126437221 has 2 divisors, whose sum is σ = 126437222. Its totient is φ = 126437220.

The previous prime is 126437173. The next prime is 126437231. The reversal of 126437221 is 122734621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72488196 + 53949025 = 8514^2 + 7345^2 .

It is a cyclic number.

It is not a de Polignac number, because 126437221 - 2⁷ = 126437093 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 126437221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126437231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63218610 + 63218611.

It is an arithmetic number, because the mean of its divisors is an integer number (63218611).

Almost surely, 2^126437221 is an apocalyptic number.

It is an amenable number.

126437221 is a deficient number, since it is larger than the sum of its proper divisors (1).

126437221 is an equidigital number, since it uses as much as digits as its factorization.

126437221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 28.

The square root of 126437221 is about 11244.4306658897. The cubic root of 126437221 is about 501.9089968528.

The spelling of 126437221 in words is "one hundred twenty-six million, four hundred thirty-seven thousand, two hundred twenty-one".