21230232111 has 40 divisors (see below), whose sum is σ = 36632583504. Its totient is φ = 12109927680.

The previous prime is 21230232091. The next prime is 21230232119. The reversal of 21230232111 is 11123203212.

It is not a de Polignac number, because 21230232111 - 2¹⁸ = 21229969967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21230232119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 685660 + ... + 715953.

Almost surely, 2^21230232111 is an apocalyptic number.

21230232111 is a deficient number, since it is larger than the sum of its proper divisors (15402351393).

21230232111 is a wasteful number, since it uses less digits than its factorization.

21230232111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1401653 (or 1401644 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21230232111 its reverse (11123203212), we get a palindrome (32353435323).

The spelling of 21230232111 in words is "twenty-one billion, two hundred thirty million, two hundred thirty-two thousand, one hundred eleven".