21031220013210 has 192 divisors, whose sum is σ = 60245719163136. Its totient is φ = 5047772083200.

The previous prime is 21031220013203. The next prime is 21031220013257. The reversal of 21031220013210 is 1231002213012.

21031220013210 is a `hidden beast` number, since 2 + 10 + 312 + 20 + 0 + 1 + 321 + 0 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 471181054 + ... + 471225686.

It is an arithmetic number, because the mean of its divisors is an integer number (313779787308).

Almost surely, 2^{21031220013210} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21031220013210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30122859581568).

21031220013210 is an abundant number, since it is smaller than the sum of its proper divisors (39214499149926).

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

21031220013210 is a wasteful number, since it uses less digits than its factorization.

21031220013210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49381 (or 49378 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21031220013210 its reverse (1231002213012), we get a palindrome (22262222226222).

The spelling of 21031220013210 in words is "twenty-one trillion, thirty-one billion, two hundred twenty million, thirteen thousand, two hundred ten".