21401442223 has 6 divisors (see below), whose sum is σ = 24895555296. Its totient is φ = 18344093292.

The previous prime is 21401442221. The next prime is 21401442367. The reversal of 21401442223 is 32224410412.

It is not a de Polignac number, because 21401442223 - 2¹ = 21401442221 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 (21401442221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 218382015 + ... + 218382112.

It is an arithmetic number, because the mean of its divisors is an integer number (4149259216).

Almost surely, 2^21401442223 is an apocalyptic number.

21401442223 is a deficient number, since it is larger than the sum of its proper divisors (3494113073).

21401442223 is an equidigital number, since it uses as much as digits as its factorization.

21401442223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436764141 (or 436764134 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 21401442223 its reverse (32224410412), we get a palindrome (53625852635).

The spelling of 21401442223 in words is "twenty-one billion, four hundred one million, four hundred forty-two thousand, two hundred twenty-three".