21442101233 has 16 divisors (see below), whose sum is σ = 25611350016. Its totient is φ = 17551915920.

The previous prime is 21442101151. The next prime is 21442101259. The reversal of 21442101233 is 33210124412.

It is not a de Polignac number, because 21442101233 - 2²⁰ = 21441052657 is a prime.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21442101199 and 21442101208.

It is not an unprimeable number, because it can be changed into a prime (21442101533) 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, 3941 + ... + 207122.

It is an arithmetic number, because the mean of its divisors is an integer number (1600709376).

Almost surely, 2^21442101233 is an apocalyptic number.

21442101233 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21442101233 is a deficient number, since it is larger than the sum of its proper divisors (4169248783).

21442101233 is a wasteful number, since it uses less digits than its factorization.

21442101233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211724.

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

Adding to 21442101233 its reverse (33210124412), we get a palindrome (54652225645).

The spelling of 21442101233 in words is "twenty-one billion, four hundred forty-two million, one hundred one thousand, two hundred thirty-three".