21133103455444 has 24 divisors (see below), whose sum is σ = 37798833719808. Its totient is φ = 10333782295200.

The previous prime is 21133103455433. The next prime is 21133103455463. The reversal of 21133103455444 is 44455430133112.

It is a junction number, because it is equal to n+sod(n) for n = 21133103455397 and 21133103455406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42956844 + ... + 43446019.

It is an arithmetic number, because the mean of its divisors is an integer number (1574951404992).

Almost surely, 2^{21133103455444} is an apocalyptic number.

It is an amenable number.

21133103455444 is a deficient number, since it is larger than the sum of its proper divisors (16665730264364).

21133103455444 is a wasteful number, since it uses less digits than its factorization.

21133103455444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86404215 (or 86404213 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 40.

Adding to 21133103455444 its reverse (44455430133112), we get a palindrome (65588533588556).

The spelling of 21133103455444 in words is "twenty-one trillion, one hundred thirty-three billion, one hundred three million, four hundred fifty-five thousand, four hundred forty-four".