21221011230 has 64 divisors (see below), whose sum is σ = 51848252928. Its totient is φ = 5557253760.

The previous prime is 21221011181. The next prime is 21221011241. The reversal of 21221011230 is 3211012212.

It is a super-2 number, since 2×21221011230² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1175049 + ... + 1192971.

It is an arithmetic number, because the mean of its divisors is an integer number (810128952).

Almost surely, 2^21221011230 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21221011230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25924126464).

21221011230 is an abundant number, since it is smaller than the sum of its proper divisors (30627241698).

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

21221011230 is a wasteful number, since it uses less digits than its factorization.

21221011230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18641.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21221011230 its reverse (3211012212), we get a palindrome (24432023442).

The spelling of 21221011230 in words is "twenty-one billion, two hundred twenty-one million, eleven thousand, two hundred thirty".