21414220433 has 4 divisors (see below), whose sum is σ = 21538002228. Its totient is φ = 21290438640.

The previous prime is 21414220411. The next prime is 21414220447. The reversal of 21414220433 is 33402241412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16320829009 + 5093391424 = 127753^2 + 71368^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21414220433 is a prime.

It is a super-2 number, since 2×21414220433² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21414220453) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61890638 + ... + 61890983.

It is an arithmetic number, because the mean of its divisors is an integer number (5384500557).

Almost surely, 2^21414220433 is an apocalyptic number.

It is an amenable number.

21414220433 is a deficient number, since it is larger than the sum of its proper divisors (123781795).

21414220433 is a wasteful number, since it uses less digits than its factorization.

21414220433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123781794.

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

Adding to 21414220433 its reverse (33402241412), we get a palindrome (54816461845).

The spelling of 21414220433 in words is "twenty-one billion, four hundred fourteen million, two hundred twenty thousand, four hundred thirty-three".