10203121111 has 8 divisors (see below), whose sum is σ = 10283772800. Its totient is φ = 10122573240.

The previous prime is 10203121079. The next prime is 10203121139. The reversal of 10203121111 is 11112130201.

It is a happy number.

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 10203121111 - 2⁵ = 10203121079 is a prime.

It is the 101011-st Hogben number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10203121091 and 10203121100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10203124111) by changing a digit.

It is a nontrivial repunit in base 101010.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 177646 + ... + 227956.

It is an arithmetic number, because the mean of its divisors is an integer number (1285471600).

Almost surely, 2^10203121111 is an apocalyptic number.

10203121111 is a deficient number, since it is larger than the sum of its proper divisors (80651689).

10203121111 is a wasteful number, since it uses less digits than its factorization.

10203121111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51909.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 10203121111 its reverse (11112130201), we get a palindrome (21315251312).

The spelling of 10203121111 in words is "ten billion, two hundred three million, one hundred twenty-one thousand, one hundred eleven".