21000311202012 has 96 divisors (see below), whose sum is σ = 51702339360000. Its totient is φ = 6615920788992.

The previous prime is 21000311202001. The next prime is 21000311202029. The reversal of 21000311202012 is 21020211300012.

It is a junction number, because it is equal to n+sod(n) for n = 21000311201982 and 21000311202000.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 318187288 + ... + 318253280.

It is an arithmetic number, because the mean of its divisors is an integer number (538566035000).

Almost surely, 2^{21000311202012} 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 21000311202012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25851169680000).

21000311202012 is an abundant number, since it is smaller than the sum of its proper divisors (30702028157988).

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

21000311202012 is a wasteful number, since it uses less digits than its factorization.

21000311202012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69315 (or 69313 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21000311202012 its reverse (21020211300012), we get a palindrome (42020522502024).

The spelling of 21000311202012 in words is "twenty-one trillion, three hundred eleven million, two hundred two thousand, twelve".