203021302121 has 24 divisors (see below), whose sum is σ = 227387865600. Its totient is φ = 181076904800.

The previous prime is 203021302117. The next prime is 203021302139. The reversal of 203021302121 is 121203120302.

It is not a de Polignac number, because 203021302121 - 2² = 203021302117 is a prime.

It is a super-2 number, since 2×203021302121² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 203021302121.

It is not an unprimeable number, because it can be changed into a prime (203021302181) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3605816 + ... + 3661686.

It is an arithmetic number, because the mean of its divisors is an integer number (9474494400).

Almost surely, 2^203021302121 is an apocalyptic number.

It is an amenable number.

203021302121 is a deficient number, since it is larger than the sum of its proper divisors (24366563479).

203021302121 is a wasteful number, since it uses less digits than its factorization.

203021302121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56461 (or 56450 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 203021302121 its reverse (121203120302), we get a palindrome (324224422423).

The spelling of 203021302121 in words is "two hundred three billion, twenty-one million, three hundred two thousand, one hundred twenty-one".