21221432411 has 4 divisors (see below), whose sum is σ = 21388530432. Its totient is φ = 21054334392.

The previous prime is 21221432389. The next prime is 21221432417. The reversal of 21221432411 is 11423412212.

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 21221432411 - 2³⁰ = 20147690587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21221432417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83548820 + ... + 83549073.

It is an arithmetic number, because the mean of its divisors is an integer number (5347132608).

Almost surely, 2^21221432411 is an apocalyptic number.

21221432411 is a deficient number, since it is larger than the sum of its proper divisors (167098021).

21221432411 is a wasteful number, since it uses less digits than its factorization.

21221432411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167098020.

The product of its digits is 768, while the sum is 23.

Adding to 21221432411 its reverse (11423412212), we get a palindrome (32644844623).

The spelling of 21221432411 in words is "twenty-one billion, two hundred twenty-one million, four hundred thirty-two thousand, four hundred eleven".