121213424403 has 16 divisors (see below), whose sum is σ = 179580840960. Its totient is φ = 80806520808.

The previous prime is 121213424357. The next prime is 121213424419. The reversal of 121213424403 is 304424312121.

121213424403 is a `hidden beast` number, since 1 + 2 + 1 + 213 + 4 + 2 + 440 + 3 = 666.

It is not a de Polignac number, because 121213424403 - 2⁸ = 121213424147 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (121213424503) 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, 1570626 + ... + 1645992.

It is an arithmetic number, because the mean of its divisors is an integer number (11223802560).

Almost surely, 2^121213424403 is an apocalyptic number.

121213424403 is a deficient number, since it is larger than the sum of its proper divisors (58367416557).

121213424403 is an equidigital number, since it uses as much as digits as its factorization.

121213424403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134943 (or 134937 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

Adding to 121213424403 its reverse (304424312121), we get a palindrome (425637736524).

The spelling of 121213424403 in words is "one hundred twenty-one billion, two hundred thirteen million, four hundred twenty-four thousand, four hundred three".