21221310230 has 32 divisors (see below), whose sum is σ = 38434553568. Its totient is φ = 8436153600.

The previous prime is 21221310221. The next prime is 21221310241. The reversal of 21221310230 is 3201312212.

It is a junction number, because it is equal to n+sod(n) for n = 21221310199 and 21221310208.

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, 1539770 + ... + 1553490.

It is an arithmetic number, because the mean of its divisors is an integer number (1201079799).

Almost surely, 2^21221310230 is an apocalyptic number.

21221310230 is a deficient number, since it is larger than the sum of its proper divisors (17213243338).

21221310230 is a wasteful number, since it uses less digits than its factorization.

21221310230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14672.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21221310230 its reverse (3201312212), we get a palindrome (24422622442).

The spelling of 21221310230 in words is "twenty-one billion, two hundred twenty-one million, three hundred ten thousand, two hundred thirty".