21121044233 has 16 divisors (see below), whose sum is σ = 23253350400. Its totient is φ = 19094858640.

The previous prime is 21121044211. The next prime is 21121044251. The reversal of 21121044233 is 33244012112.

It is a de Polignac number, because none of the positive numbers 2^k-21121044233 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21121044199 and 21121044208.

It is not an unprimeable number, because it can be changed into a prime (21121044283) 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, 132278 + ... + 244416.

It is an arithmetic number, because the mean of its divisors is an integer number (1453334400).

Almost surely, 2^21121044233 is an apocalyptic number.

21121044233 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21121044233 is a deficient number, since it is larger than the sum of its proper divisors (2132306167).

21121044233 is a wasteful number, since it uses less digits than its factorization.

21121044233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112612.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21121044233 its reverse (33244012112), we get a palindrome (54365056345).

The spelling of 21121044233 in words is "twenty-one billion, one hundred twenty-one million, forty-four thousand, two hundred thirty-three".