1203421111 has 4 divisors (see below), whose sum is σ = 1255743792. Its totient is φ = 1151098432.

The previous prime is 1203421057. The next prime is 1203421123. The reversal of 1203421111 is 1111243021.

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 1203421111 - 2¹³ = 1203412919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1203424111) 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, 26161306 + ... + 26161351.

It is an arithmetic number, because the mean of its divisors is an integer number (313935948).

Almost surely, 2^1203421111 is an apocalyptic number.

1203421111 is a deficient number, since it is larger than the sum of its proper divisors (52322681).

1203421111 is an equidigital number, since it uses as much as digits as its factorization.

1203421111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52322680.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 1203421111 is about 34690.3604910644. The cubic root of 1203421111 is about 1063.6674646161.

Adding to 1203421111 its reverse (1111243021), we get a palindrome (2314664132).

The spelling of 1203421111 in words is "one billion, two hundred three million, four hundred twenty-one thousand, one hundred eleven".