21000312311312 has 10 divisors (see below), whose sum is σ = 40688105103198. Its totient is φ = 10500156155648.

The previous prime is 21000312311309. The next prime is 21000312311353. The reversal of 21000312311312 is 21311321300012.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20974604678416 + 25707632896 = 4579804^2 + 160336^2 .

It is a super-4 number, since 4×21000312311312⁴ (a number of 54 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656259759713 + ... + 656259759744.

Almost surely, 2^{21000312311312} is an apocalyptic number.

It is an amenable number.

21000312311312 is a deficient number, since it is larger than the sum of its proper divisors (19687792791886).

21000312311312 is a wasteful number, since it uses less digits than its factorization.

21000312311312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1312519519465 (or 1312519519459 counting only the distinct ones).

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

Adding to 21000312311312 its reverse (21311321300012), we get a palindrome (42311633611324).

The spelling of 21000312311312 in words is "twenty-one trillion, three hundred twelve million, three hundred eleven thousand, three hundred twelve".