126121899 has 16 divisors (see below), whose sum is σ = 175514400. Its totient is φ = 80457216.

The previous prime is 126121889. The next prime is 126121901. The reversal of 126121899 is 998121621.

It is not a de Polignac number, because 126121899 - 2⁷ = 126121771 is a prime.

It is not an unprimeable number, because it can be changed into a prime (126121819) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3417 + ... + 16245.

It is an arithmetic number, because the mean of its divisors is an integer number (10969650).

Almost surely, 2^126121899 is an apocalyptic number.

126121899 is a deficient number, since it is larger than the sum of its proper divisors (49392501).

126121899 is a wasteful number, since it uses less digits than its factorization.

126121899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12974.

The product of its digits is 15552, while the sum is 39.

The square root of 126121899 is about 11230.4006607066. The cubic root of 126121899 is about 501.4914122889.

The spelling of 126121899 in words is "one hundred twenty-six million, one hundred twenty-one thousand, eight hundred ninety-nine".