21412434331 has 4 divisors (see below), whose sum is σ = 21413668752. Its totient is φ = 21411199912.

The previous prime is 21412434283. The next prime is 21412434341. The reversal of 21412434331 is 13343421412.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21412434331 - 2⁷ = 21412434203 is a prime.

It is a super-2 number, since 2×21412434331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21412434331.

It is not an unprimeable number, because it can be changed into a prime (21412434341) 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, 590815 + ... + 626008.

It is an arithmetic number, because the mean of its divisors is an integer number (5353417188).

Almost surely, 2^21412434331 is an apocalyptic number.

21412434331 is a deficient number, since it is larger than the sum of its proper divisors (1234421).

21412434331 is a wasteful number, since it uses less digits than its factorization.

21412434331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1234420.

The product of its digits is 6912, while the sum is 28.

Adding to 21412434331 its reverse (13343421412), we get a palindrome (34755855743).

The spelling of 21412434331 in words is "twenty-one billion, four hundred twelve million, four hundred thirty-four thousand, three hundred thirty-one".