121221413103 has 16 divisors (see below), whose sum is σ = 195584129280. Its totient is φ = 65194709376.

The previous prime is 121221413101. The next prime is 121221413147. The reversal of 121221413103 is 301314122121.

It is not a de Polignac number, because 121221413103 - 2¹ = 121221413101 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 121221413103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221413101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 169777533 + ... + 169778246.

It is an arithmetic number, because the mean of its divisors is an integer number (12224008080).

Almost surely, 2^121221413103 is an apocalyptic number.

121221413103 is a deficient number, since it is larger than the sum of its proper divisors (74362716177).

121221413103 is a wasteful number, since it uses less digits than its factorization.

121221413103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339555806.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 121221413103 its reverse (301314122121), we get a palindrome (422535535224).

The spelling of 121221413103 in words is "one hundred twenty-one billion, two hundred twenty-one million, four hundred thirteen thousand, one hundred three".