121311212103 has 48 divisors (see below), whose sum is σ = 186705698400. Its totient is φ = 75682252800.

The previous prime is 121311212083. The next prime is 121311212131. The reversal of 121311212103 is 301212113121.

121311212103 is a `hidden beast` number, since 121 + 311 + 21 + 210 + 3 = 666.

It is not a de Polignac number, because 121311212103 - 2²¹ = 121309114951 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121311213103) 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, 18274701 + ... + 18281337.

It is an arithmetic number, because the mean of its divisors is an integer number (3889702050).

Almost surely, 2^121311212103 is an apocalyptic number.

121311212103 is a deficient number, since it is larger than the sum of its proper divisors (65394486297).

121311212103 is a wasteful number, since it uses less digits than its factorization.

121311212103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7952 (or 7949 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 121311212103 its reverse (301212113121), we get a palindrome (422523325224).

The spelling of 121311212103 in words is "one hundred twenty-one billion, three hundred eleven million, two hundred twelve thousand, one hundred three".