21000212211212 has 24 divisors (see below), whose sum is σ = 40078301793600. Its totient is φ = 9569716955136.

The previous prime is 21000212211211. The next prime is 21000212211217. The reversal of 21000212211212 is 21211221200012.

It is not an unprimeable number, because it can be changed into a prime (21000212211211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2556010037 + ... + 2556018252.

It is an arithmetic number, because the mean of its divisors is an integer number (1669929241400).

Almost surely, 2^{21000212211212} is an apocalyptic number.

It is an amenable number.

21000212211212 is a deficient number, since it is larger than the sum of its proper divisors (19078089582388).

21000212211212 is a wasteful number, since it uses less digits than its factorization.

21000212211212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5112028385 (or 5112028383 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21000212211212 its reverse (21211221200012), we get a palindrome (42211433411224).

It can be divided in two parts, 21000 and 212211212, that added together give a palindrome (212232212).

The spelling of 21000212211212 in words is "twenty-one trillion, two hundred twelve million, two hundred eleven thousand, two hundred twelve".