21211220230 has 8 divisors (see below), whose sum is σ = 38180196432. Its totient is φ = 8484488088.

The previous prime is 21211220227. The next prime is 21211220237. The reversal of 21211220230 is 3202211212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21211220230² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211220237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1060561002 + ... + 1060561021.

It is an arithmetic number, because the mean of its divisors is an integer number (4772524554).

Almost surely, 2^21211220230 is an apocalyptic number.

21211220230 is a deficient number, since it is larger than the sum of its proper divisors (16968976202).

21211220230 is a wasteful number, since it uses less digits than its factorization.

21211220230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2121122030.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21211220230 its reverse (3202211212), we get a palindrome (24413431442).

The spelling of 21211220230 in words is "twenty-one billion, two hundred eleven million, two hundred twenty thousand, two hundred thirty".