203121121021 has 8 divisors (see below), whose sum is σ = 249995225984. Its totient is φ = 160711216560.

The previous prime is 203121121009. The next prime is 203121121087. The reversal of 203121121021 is 120121121302.

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 203121121021 - 2²¹ = 203119023869 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 203121120986 and 203121121004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203121221021) 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, 1116050025 + ... + 1116050206.

It is an arithmetic number, because the mean of its divisors is an integer number (31249403248).

Almost surely, 2^203121121021 is an apocalyptic number.

It is an amenable number.

203121121021 is a deficient number, since it is larger than the sum of its proper divisors (46874104963).

203121121021 is a wasteful number, since it uses less digits than its factorization.

203121121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2232100251.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 203121121021 its reverse (120121121302), we get a palindrome (323242242323).

The spelling of 203121121021 in words is "two hundred three billion, one hundred twenty-one million, one hundred twenty-one thousand, twenty-one".