121521403003 has 64 divisors (see below), whose sum is σ = 176127436800. Its totient is φ = 80724188160.

The previous prime is 121521402997. The next prime is 121521403051. The reversal of 121521403003 is 300304125121.

It is a happy number.

It is not a de Polignac number, because 121521403003 - 2²⁹ = 120984532091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121521403303) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 576663 + ... + 758671.

It is an arithmetic number, because the mean of its divisors is an integer number (2751991200).

Almost surely, 2^121521403003 is an apocalyptic number.

121521403003 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

121521403003 is a deficient number, since it is larger than the sum of its proper divisors (54606033797).

121521403003 is a wasteful number, since it uses less digits than its factorization.

121521403003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182092.

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 121521403003 its reverse (300304125121), we get a palindrome (421825528124).

The spelling of 121521403003 in words is "one hundred twenty-one billion, five hundred twenty-one million, four hundred three thousand, three".