21312120203010 has 768 divisors, whose sum is σ = 73191199850496. Its totient is φ = 4178924918784.

The previous prime is 21312120202963. The next prime is 21312120203021. The reversal of 21312120203010 is 1030202121312.

21312120203010 is a `hidden beast` number, since 2 + 131 + 212 + 0 + 20 + 301 + 0 = 666.

It is a super-2 number, since 2×21312120203010² (a number of 27 digits) contains 22 as substring.

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 383 ways as a sum of consecutive naturals, for example, 6154234539 + ... + 6154238001.

It is an arithmetic number, because the mean of its divisors is an integer number (95301041472).

Almost surely, 2^{21312120203010} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21312120203010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36595599925248).

21312120203010 is an abundant number, since it is smaller than the sum of its proper divisors (51879079647486).

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

21312120203010 is a wasteful number, since it uses less digits than its factorization.

21312120203010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4439 (or 4436 counting only the distinct ones).

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

Adding to 21312120203010 its reverse (1030202121312), we get a palindrome (22342322324322).

The spelling of 21312120203010 in words is "twenty-one trillion, three hundred twelve billion, one hundred twenty million, two hundred three thousand, ten".