21712221230 has 32 divisors (see below), whose sum is σ = 45872312256. Its totient is φ = 7242994944.

The previous prime is 21712221229. The next prime is 21712221269. The reversal of 21712221230 is 3212221712.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21712221196 and 21712221205.

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, 4188959 + ... + 4194138.

It is an arithmetic number, because the mean of its divisors is an integer number (1433509758).

Almost surely, 2^21712221230 is an apocalyptic number.

21712221230 is an abundant number, since it is smaller than the sum of its proper divisors (24160091026).

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

21712221230 is a wasteful number, since it uses less digits than its factorization.

21712221230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8383148.

The product of its (nonzero) digits is 672, while the sum is 23.

Adding to 21712221230 its reverse (3212221712), we get a palindrome (24924442942).

The spelling of 21712221230 in words is "twenty-one billion, seven hundred twelve million, two hundred twenty-one thousand, two hundred thirty".