21401422309 has 4 divisors (see below), whose sum is σ = 21408514240. Its totient is φ = 21394330380.

The previous prime is 21401422307. The next prime is 21401422319. The reversal of 21401422309 is 90322410412.

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.

It is a cyclic number.

It is not a de Polignac number, because 21401422309 - 2¹ = 21401422307 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21401422307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3541437 + ... + 3547474.

It is an arithmetic number, because the mean of its divisors is an integer number (5352128560).

Almost surely, 2^21401422309 is an apocalyptic number.

It is an amenable number.

21401422309 is a deficient number, since it is larger than the sum of its proper divisors (7091931).

21401422309 is an equidigital number, since it uses as much as digits as its factorization.

21401422309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7091930.

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

The spelling of 21401422309 in words is "twenty-one billion, four hundred one million, four hundred twenty-two thousand, three hundred nine".