21214420223 has 4 divisors (see below), whose sum is σ = 21215647320. Its totient is φ = 21213193128.

The previous prime is 21214420219. The next prime is 21214420237. The reversal of 21214420223 is 32202441212.

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 21214420223 - 2² = 21214420219 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 (21214420243) 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, 587240 + ... + 622317.

It is an arithmetic number, because the mean of its divisors is an integer number (5303911830).

Almost surely, 2^21214420223 is an apocalyptic number.

21214420223 is a deficient number, since it is larger than the sum of its proper divisors (1227097).

21214420223 is a wasteful number, since it uses less digits than its factorization.

21214420223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1227096.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 21214420223 its reverse (32202441212), we get a palindrome (53416861435).

The spelling of 21214420223 in words is "twenty-one billion, two hundred fourteen million, four hundred twenty thousand, two hundred twenty-three".