21120211230 has 16 divisors (see below), whose sum is σ = 50688507024. Its totient is φ = 5632056320.

The previous prime is 21120211213. The next prime is 21120211237. The reversal of 21120211230 is 3211202112.

It is a super-2 number, since 2×21120211230² (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 congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120211237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 352003491 + ... + 352003550.

It is an arithmetic number, because the mean of its divisors is an integer number (3168031689).

Almost surely, 2^21120211230 is an apocalyptic number.

21120211230 is an abundant number, since it is smaller than the sum of its proper divisors (29568295794).

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

21120211230 is a wasteful number, since it uses less digits than its factorization.

21120211230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704007051.

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

Adding to 21120211230 its reverse (3211202112), we get a palindrome (24331413342).

The spelling of 21120211230 in words is "twenty-one billion, one hundred twenty million, two hundred eleven thousand, two hundred thirty".