21321431641 has 8 divisors (see below), whose sum is σ = 22580518464. Its totient is φ = 20090017200.

The previous prime is 21321431617. The next prime is 21321431653. The reversal of 21321431641 is 14613412312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21321431641 - 2²⁹ = 20784560729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21321431611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6916510 + ... + 6919591.

It is an arithmetic number, because the mean of its divisors is an integer number (2822564808).

Almost surely, 2^21321431641 is an apocalyptic number.

It is an amenable number.

21321431641 is a deficient number, since it is larger than the sum of its proper divisors (1259086823).

21321431641 is a wasteful number, since it uses less digits than its factorization.

21321431641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13836191.

The product of its digits is 3456, while the sum is 28.

Adding to 21321431641 its reverse (14613412312), we get a palindrome (35934843953).

The spelling of 21321431641 in words is "twenty-one billion, three hundred twenty-one million, four hundred thirty-one thousand, six hundred forty-one".