21233121013 has 16 divisors (see below), whose sum is σ = 23402252160. Its totient is φ = 19144771776.

The previous prime is 21233120999. The next prime is 21233121017. The reversal of 21233121013 is 31012133212.

It is not a de Polignac number, because 21233121013 - 2³³ = 12643186421 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 (21233121017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32256 + ... + 208582.

It is an arithmetic number, because the mean of its divisors is an integer number (1462640760).

Almost surely, 2^21233121013 is an apocalyptic number.

It is an amenable number.

21233121013 is a deficient number, since it is larger than the sum of its proper divisors (2169131147).

21233121013 is a wasteful number, since it uses less digits than its factorization.

21233121013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176556.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21233121013 its reverse (31012133212), we get a palindrome (52245254225).

The spelling of 21233121013 in words is "twenty-one billion, two hundred thirty-three million, one hundred twenty-one thousand, thirteen".