21134204223 has 16 divisors (see below), whose sum is σ = 30743311872. Its totient is φ = 12807504000.

The previous prime is 21134204141. The next prime is 21134204243. The reversal of 21134204223 is 32240243112.

It is a happy number.

It is not a de Polignac number, because 21134204223 - 2⁸ = 21134203967 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21134204193 and 21134204202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21134204243) 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, 527178 + ... + 565848.

It is an arithmetic number, because the mean of its divisors is an integer number (1921456992).

Almost surely, 2^21134204223 is an apocalyptic number.

21134204223 is a deficient number, since it is larger than the sum of its proper divisors (9609107649).

21134204223 is a wasteful number, since it uses less digits than its factorization.

21134204223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55246.

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21134204223 its reverse (32240243112), we get a palindrome (53374447335).

The spelling of 21134204223 in words is "twenty-one billion, one hundred thirty-four million, two hundred four thousand, two hundred twenty-three".