126225621 has 14 divisors (see below), whose sum is σ = 189252950. Its totient is φ = 84149928.

The previous prime is 126225559. The next prime is 126225623. The reversal of 126225621 is 126522621.

126225621 is a `hidden beast` number, since 12 + 6 + 2 + 25 + 621 = 666.

It can be written as a sum of positive squares in only one way, i.e., 106378596 + 19847025 = 10314^2 + 4455^2 .

It is not a de Polignac number, because 126225621 - 2⁶ = 126225557 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126225623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 85846 + ... + 87303.

Almost surely, 2^126225621 is an apocalyptic number.

It is an amenable number.

126225621 is a deficient number, since it is larger than the sum of its proper divisors (63027329).

126225621 is an frugal number, since it uses more digits than its factorization.

126225621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173167 (or 173152 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 126225621 is about 11235.0176234842. The cubic root of 126225621 is about 501.6288492713.

The spelling of 126225621 in words is "one hundred twenty-six million, two hundred twenty-five thousand, six hundred twenty-one".