203021113021 has 8 divisors (see below), whose sum is σ = 214998331320. Its totient is φ = 191047761408.

The previous prime is 203021113013. The next prime is 203021113027. The reversal of 203021113021 is 120311120302.

It can be written as a sum of positive squares in 4 ways, for example, as 74417112025 + 128604000996 = 272795^2 + 358614^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 203021113021 - 2³ = 203021113013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 203021112986 and 203021113004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203021113027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 858216 + ... + 1068913.

It is an arithmetic number, because the mean of its divisors is an integer number (26874791415).

Almost surely, 2^203021113021 is an apocalyptic number.

It is an amenable number.

203021113021 is a deficient number, since it is larger than the sum of its proper divisors (11977218299).

203021113021 is a wasteful number, since it uses less digits than its factorization.

203021113021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1933343.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 203021113021 its reverse (120311120302), we get a palindrome (323332233323).

The spelling of 203021113021 in words is "two hundred three billion, twenty-one million, one hundred thirteen thousand, twenty-one".