21001202201312 has 144 divisors (see below), whose sum is σ = 43814116185840. Its totient is φ = 9881619296256.

The previous prime is 21001202201311. The next prime is 21001202201321. The reversal of 21001202201312 is 21310220210012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001202201311) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24505486388 + ... + 24505487244.

It is an arithmetic number, because the mean of its divisors is an integer number (304264695735).

Almost surely, 2^{21001202201312} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21001202201312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21907058092920).

21001202201312 is an abundant number, since it is smaller than the sum of its proper divisors (22812913984528).

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

21001202201312 is an equidigital number, since it uses as much as digits as its factorization.

21001202201312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1981 (or 1704 counting only the distinct ones).

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

Adding to 21001202201312 its reverse (21310220210012), we get a palindrome (42311422411324).

The spelling of 21001202201312 in words is "twenty-one trillion, one billion, two hundred two million, two hundred one thousand, three hundred twelve".