126221913 has 6 divisors (see below), whose sum is σ = 182320554. Its totient is φ = 84147936.

The previous prime is 126221897. The next prime is 126221933. The reversal of 126221913 is 319122621.

126221913 is a `hidden beast` number, since 12 + 622 + 19 + 13 = 666.

It can be written as a sum of positive squares in only one way, i.e., 76265289 + 49956624 = 8733^2 + 7068^2 .

It is not a de Polignac number, because 126221913 - 2⁴ = 126221897 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (126221933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7012320 + ... + 7012337.

It is an arithmetic number, because the mean of its divisors is an integer number (30386759).

Almost surely, 2^126221913 is an apocalyptic number.

It is an amenable number.

126221913 is a deficient number, since it is larger than the sum of its proper divisors (56098641).

126221913 is a wasteful number, since it uses less digits than its factorization.

126221913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14024663 (or 14024660 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 126221913 is about 11234.8526025044. The cubic root of 126221913 is about 501.6239372786.

It can be divided in two parts, 12622 and 1913, that added together give a triangular number (14535 = T₁₇₀).

The spelling of 126221913 in words is "one hundred twenty-six million, two hundred twenty-one thousand, nine hundred thirteen".