111111203421 has 12 divisors (see below), whose sum is σ = 160523334972. Its totient is φ = 74060578176.

The previous prime is 111111203407. The next prime is 111111203443. The reversal of 111111203421 is 124302111111.

111111203421 is a `hidden beast` number, since 11 + 111 + 120 + 3 + 421 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 63821916900 + 47289286521 = 252630^2 + 217461^2 .

It is not a de Polignac number, because 111111203421 - 2⁷ = 111111203293 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 111111203394 and 111111203403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111111203491) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1077756 + ... + 1176341.

It is an arithmetic number, because the mean of its divisors is an integer number (13376944581).

Almost surely, 2^111111203421 is an apocalyptic number.

It is an amenable number.

111111203421 is a deficient number, since it is larger than the sum of its proper divisors (49412131551).

111111203421 is a wasteful number, since it uses less digits than its factorization.

111111203421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2259580 (or 2259577 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 111111203421 its reverse (124302111111), we get a palindrome (235413314532).

The spelling of 111111203421 in words is "one hundred eleven billion, one hundred eleven million, two hundred three thousand, four hundred twenty-one".