21211212230 has 32 divisors (see below), whose sum is σ = 41126587488. Its totient is φ = 7830028800.

The previous prime is 21211212173. The next prime is 21211212233. The reversal of 21211212230 is 3221211212.

It is a super-2 number, since 2×21211212230² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21211212199 and 21211212208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211212233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 635150 + ... + 667710.

It is an arithmetic number, because the mean of its divisors is an integer number (1285205859).

Almost surely, 2^21211212230 is an apocalyptic number.

21211212230 is a deficient number, since it is larger than the sum of its proper divisors (19915375258).

21211212230 is a wasteful number, since it uses less digits than its factorization.

21211212230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37592.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21211212230 its reverse (3221211212), we get a palindrome (24432423442).

The spelling of 21211212230 in words is "twenty-one billion, two hundred eleven million, two hundred twelve thousand, two hundred thirty".