203112212121 has 48 divisors (see below), whose sum is σ = 372381985920. Its totient is φ = 107136095040.

The previous prime is 203112212119. The next prime is 203112212161. The reversal of 203112212121 is 121212211302.

203112212121 is a `hidden beast` number, since 20 + 311 + 2 + 212 + 121 = 666.

It is not a de Polignac number, because 203112212121 - 2¹ = 203112212119 is a prime.

203112212121 is a modest number, since divided by 212121 gives 203112 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 203112212094 and 203112212103.

It is not an unprimeable number, because it can be changed into a prime (203112212161) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3147550 + ... + 3211431.

It is an arithmetic number, because the mean of its divisors is an integer number (7757958040).

Almost surely, 2^203112212121 is an apocalyptic number.

203112212121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

203112212121 is a deficient number, since it is larger than the sum of its proper divisors (169269773799).

203112212121 is a wasteful number, since it uses less digits than its factorization.

203112212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6359023 (or 6359004 counting only the distinct ones).

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

Adding to 203112212121 its reverse (121212211302), we get a palindrome (324324423423).

The spelling of 203112212121 in words is "two hundred three billion, one hundred twelve million, two hundred twelve thousand, one hundred twenty-one".