21030203111 has 4 divisors (see below), whose sum is σ = 21944559792. Its totient is φ = 20115846432.

The previous prime is 21030203101. The next prime is 21030203123. The reversal of 21030203111 is 11130203012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21030203111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21030203101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 457178306 + ... + 457178351.

It is an arithmetic number, because the mean of its divisors is an integer number (5486139948).

Almost surely, 2^21030203111 is an apocalyptic number.

21030203111 is a deficient number, since it is larger than the sum of its proper divisors (914356681).

21030203111 is an equidigital number, since it uses as much as digits as its factorization.

21030203111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 914356680.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21030203111 its reverse (11130203012), we get a palindrome (32160406123).

Subtracting from 21030203111 its reverse (11130203012), we obtain a palindrome (9900000099).

The spelling of 21030203111 in words is "twenty-one billion, thirty million, two hundred three thousand, one hundred eleven".