21031311102230 has 64 divisors (see below), whose sum is σ = 47090758010688. Its totient is φ = 6644198645760.

The previous prime is 21031311102223. The next prime is 21031311102233. The reversal of 21031311102230 is 3220111313012.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031311102233) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 432540707 + ... + 432589326.

It is an arithmetic number, because the mean of its divisors is an integer number (735793093917).

Almost surely, 2^{21031311102230} is an apocalyptic number.

21031311102230 is an abundant number, since it is smaller than the sum of its proper divisors (26059446908458).

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

21031311102230 is a wasteful number, since it uses less digits than its factorization.

21031311102230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 865130081.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 21031311102230 its reverse (3220111313012), we get a palindrome (24251422415242).

The spelling of 21031311102230 in words is "twenty-one trillion, thirty-one billion, three hundred eleven million, one hundred two thousand, two hundred thirty".