21446433401 has 4 divisors (see below), whose sum is σ = 21446726400. Its totient is φ = 21446140404.

The previous prime is 21446433391. The next prime is 21446433413. The reversal of 21446433401 is 10433464412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21446433401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21446433451) 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, 67340 + ... + 217778.

It is an arithmetic number, because the mean of its divisors is an integer number (5361681600).

Almost surely, 2^21446433401 is an apocalyptic number.

It is an amenable number.

21446433401 is a deficient number, since it is larger than the sum of its proper divisors (292999).

21446433401 is a wasteful number, since it uses less digits than its factorization.

21446433401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292998.

The product of its (nonzero) digits is 27648, while the sum is 32.

Adding to 21446433401 its reverse (10433464412), we get a palindrome (31879897813).

The spelling of 21446433401 in words is "twenty-one billion, four hundred forty-six million, four hundred thirty-three thousand, four hundred one".