21440401433 has 16 divisors (see below), whose sum is σ = 24028690176. Its totient is φ = 18958947840.

The previous prime is 21440401427. The next prime is 21440401483. The reversal of 21440401433 is 33410404412.

It is a cyclic number.

It is not a de Polignac number, because 21440401433 - 2²⁶ = 21373292569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21440401483) 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, 2092160 + ... + 2102382.

It is an arithmetic number, because the mean of its divisors is an integer number (1501793136).

Almost surely, 2^21440401433 is an apocalyptic number.

It is an amenable number.

21440401433 is a deficient number, since it is larger than the sum of its proper divisors (2588288743).

21440401433 is a wasteful number, since it uses less digits than its factorization.

21440401433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15424.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 21440401433 its reverse (33410404412), we get a palindrome (54850805845).

The spelling of 21440401433 in words is "twenty-one billion, four hundred forty million, four hundred one thousand, four hundred thirty-three".