21232213230 has 32 divisors (see below), whose sum is σ = 51000326784. Its totient is φ = 5657144096.

The previous prime is 21232213217. The next prime is 21232213267. The reversal of 21232213230 is 3231223212.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21232213197 and 21232213206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 262512 + ... + 333731.

It is an arithmetic number, because the mean of its divisors is an integer number (1593760212).

Almost surely, 2^21232213230 is an apocalyptic number.

21232213230 is an abundant number, since it is smaller than the sum of its proper divisors (29768113554).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21232213230 is a wasteful number, since it uses less digits than its factorization.

21232213230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 597440.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21232213230 its reverse (3231223212), we get a palindrome (24463436442).

The spelling of 21232213230 in words is "twenty-one billion, two hundred thirty-two million, two hundred thirteen thousand, two hundred thirty".