1203111212121 has 96 divisors (see below), whose sum is σ = 2251190043648. Its totient is φ = 625135579200.

The previous prime is 1203111212113. The next prime is 1203111212143. The reversal of 1203111212121 is 1212121113021.

It is a happy number.

1203111212121 is a `hidden beast` number, since 1 + 20 + 311 + 1 + 212 + 121 = 666.

It is not a de Polignac number, because 1203111212121 - 2³ = 1203111212113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1203111212094 and 1203111212103.

It is not an unprimeable number, because it can be changed into a prime (1203111212111) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1075546 + ... + 1887596.

It is an arithmetic number, because the mean of its divisors is an integer number (23449896288).

Almost surely, 2^{1203111212121} is an apocalyptic number.

It is an amenable number.

1203111212121 is a deficient number, since it is larger than the sum of its proper divisors (1048078831527).

1203111212121 is an equidigital number, since it uses as much as digits as its factorization.

1203111212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 812153 (or 812141 counting only the distinct ones).

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

Adding to 1203111212121 its reverse (1212121113021), we get a palindrome (2415232325142).

The spelling of 1203111212121 in words is "one trillion, two hundred three billion, one hundred eleven million, two hundred twelve thousand, one hundred twenty-one".