21311211230 has 16 divisors (see below), whose sum is σ = 39010353840. Its totient is φ = 8380001472.

The previous prime is 21311211221. The next prime is 21311211239. The reversal of 21311211230 is 3211211312.

It is an interprime number because it is at equal distance from previous prime (21311211221) and next prime (21311211239).

It is a super-2 number, since 2×21311211230² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21311211199 and 21311211208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21311211239) 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, 18059759 + ... + 18060938.

It is an arithmetic number, because the mean of its divisors is an integer number (2438147115).

Almost surely, 2^21311211230 is an apocalyptic number.

21311211230 is a deficient number, since it is larger than the sum of its proper divisors (17699142610).

21311211230 is a wasteful number, since it uses less digits than its factorization.

21311211230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36120763.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21311211230 its reverse (3211211312), we get a palindrome (24522422542).

The spelling of 21311211230 in words is "twenty-one billion, three hundred eleven million, two hundred eleven thousand, two hundred thirty".