21213002223 has 32 divisors (see below), whose sum is σ = 36074488320. Its totient is φ = 12068291520.

The previous prime is 21213002221. The next prime is 21213002227. The reversal of 21213002223 is 32220031212.

It is not a de Polignac number, because 21213002223 - 2¹ = 21213002221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21213002196 and 21213002205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213002221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 204318 + ... + 290123.

It is an arithmetic number, because the mean of its divisors is an integer number (1127327760).

Almost surely, 2^21213002223 is an apocalyptic number.

21213002223 is a deficient number, since it is larger than the sum of its proper divisors (14861486097).

21213002223 is a wasteful number, since it uses less digits than its factorization.

21213002223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494684 (or 494678 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21213002223 its reverse (32220031212), we get a palindrome (53433033435).

The spelling of 21213002223 in words is "twenty-one billion, two hundred thirteen million, two thousand, two hundred twenty-three".