111203210421 has 10 divisors (see below), whose sum is σ = 166118376182. Its totient is φ = 74135473560.

The previous prime is 111203210309. The next prime is 111203210453. The reversal of 111203210421 is 124012302111.

111203210421 is a `hidden beast` number, since 1 + 11 + 20 + 3 + 210 + 421 = 666.

It can be written as a sum of positive squares in only one way, i.e., 75325547025 + 35877663396 = 274455^2 + 189414^2 .

It is not a de Polignac number, because 111203210421 - 2¹⁵ = 111203177653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111203210394 and 111203210403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111203210821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 686439490 + ... + 686439651.

Almost surely, 2^111203210421 is an apocalyptic number.

It is an amenable number.

111203210421 is a deficient number, since it is larger than the sum of its proper divisors (54915165761).

111203210421 is an equidigital number, since it uses as much as digits as its factorization.

111203210421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1372879153 (or 1372879144 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 111203210421 its reverse (124012302111), we get a palindrome (235215512532).

The spelling of 111203210421 in words is "one hundred eleven billion, two hundred three million, two hundred ten thousand, four hundred twenty-one".