121121212103 has 6 divisors (see below), whose sum is σ = 127831528944. Its totient is φ = 114746411124.

The previous prime is 121121212099. The next prime is 121121212133. The reversal of 121121212103 is 301212121121.

It is a happy number.

It is not a de Polignac number, because 121121212103 - 2² = 121121212099 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 (121121212133) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 167757551 + ... + 167758272.

It is an arithmetic number, because the mean of its divisors is an integer number (21305254824).

Almost surely, 2^121121212103 is an apocalyptic number.

121121212103 is a deficient number, since it is larger than the sum of its proper divisors (6710316841).

121121212103 is an equidigital number, since it uses as much as digits as its factorization.

121121212103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335515861 (or 335515842 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 121121212103 its reverse (301212121121), we get a palindrome (422333333224).

The spelling of 121121212103 in words is "one hundred twenty-one billion, one hundred twenty-one million, two hundred twelve thousand, one hundred three".