21421400223 has 16 divisors (see below), whose sum is σ = 30220916480. Its totient is φ = 13459198464.

The previous prime is 21421400201. The next prime is 21421400237. The reversal of 21421400223 is 32200412412.

It is not a de Polignac number, because 21421400223 - 2⁹ = 21421399711 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21421400223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21421400243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 962611 + ... + 984612.

It is an arithmetic number, because the mean of its divisors is an integer number (1888807280).

Almost surely, 2^21421400223 is an apocalyptic number.

21421400223 is a deficient number, since it is larger than the sum of its proper divisors (8799516257).

21421400223 is a wasteful number, since it uses less digits than its factorization.

21421400223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1947438.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21421400223 its reverse (32200412412), we get a palindrome (53621812635).

The spelling of 21421400223 in words is "twenty-one billion, four hundred twenty-one million, four hundred thousand, two hundred twenty-three".