20121403 has 4 divisors (see below), whose sum is σ = 20143728. Its totient is φ = 20099080.

The previous prime is 20121401. The next prime is 20121427. The reversal of 20121403 is 30412102.

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 20121403 - 2¹ = 20121401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20121401) 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 3 ways as a sum of consecutive naturals, for example, 9751 + ... + 11632.

It is an arithmetic number, because the mean of its divisors is an integer number (5035932).

Almost surely, 2^20121403 is an apocalyptic number.

20121403 is a deficient number, since it is larger than the sum of its proper divisors (22325).

20121403 is an equidigital number, since it uses as much as digits as its factorization.

20121403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22324.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 20121403 is about 4485.6886873701. The cubic root of 20121403 is about 271.9898848242.

Adding to 20121403 its reverse (30412102), we get a palindrome (50533505).

The spelling of 20121403 in words is "twenty million, one hundred twenty-one thousand, four hundred three".