203121021011 has 8 divisors (see below), whose sum is σ = 206428400640. Its totient is φ = 199834121032.

The previous prime is 203121020981. The next prime is 203121021017. The reversal of 203121021011 is 110120121302.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-203121021011 is a prime.

It is a super-2 number, since 2×203121021011² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (203121021017) 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, 5099915 + ... + 5139588.

It is an arithmetic number, because the mean of its divisors is an integer number (25803550080).

Almost surely, 2^203121021011 is an apocalyptic number.

203121021011 is a deficient number, since it is larger than the sum of its proper divisors (3307379629).

203121021011 is a wasteful number, since it uses less digits than its factorization.

203121021011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10239825.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 203121021011 its reverse (110120121302), we get a palindrome (313241142313).

The spelling of 203121021011 in words is "two hundred three billion, one hundred twenty-one million, twenty-one thousand, eleven".