126121403 has 4 divisors (see below), whose sum is σ = 128003880. Its totient is φ = 124238928.

The previous prime is 126121399. The next prime is 126121417. The reversal of 126121403 is 304121621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 126121403 - 2² = 126121399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126121483) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 941138 + ... + 941271.

It is an arithmetic number, because the mean of its divisors is an integer number (32000970).

Almost surely, 2^126121403 is an apocalyptic number.

126121403 is a deficient number, since it is larger than the sum of its proper divisors (1882477).

126121403 is an equidigital number, since it uses as much as digits as its factorization.

126121403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1882476.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 126121403 is about 11230.3785777684. The cubic root of 126121403 is about 501.4907548825.

The spelling of 126121403 in words is "one hundred twenty-six million, one hundred twenty-one thousand, four hundred three".