21122122230 has 48 divisors (see below), whose sum is σ = 59910022224. Its totient is φ = 5120514240.

The previous prime is 21122122193. The next prime is 21122122237. The reversal of 21122122230 is 3222122112.

21122122230 is a `hidden beast` number, since 211 + 221 + 2 + 2 + 230 = 666.

It is a super-2 number, since 2×21122122230² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122122237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10666749 + ... + 10668728.

It is an arithmetic number, because the mean of its divisors is an integer number (1248125463).

Almost surely, 2^21122122230 is an apocalyptic number.

21122122230 is an abundant number, since it is smaller than the sum of its proper divisors (38787899994).

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

21122122230 is a wasteful number, since it uses less digits than its factorization.

21122122230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21335501 (or 21335498 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21122122230 its reverse (3222122112), we get a palindrome (24344244342).

The spelling of 21122122230 in words is "twenty-one billion, one hundred twenty-two million, one hundred twenty-two thousand, two hundred thirty".