21211102231212 has 48 divisors (see below), whose sum is σ = 51114176789760. Its totient is φ = 6840844661952.

The previous prime is 21211102231211. The next prime is 21211102231247. The reversal of 21211102231212 is 21213220111212.

21211102231212 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (21211102231211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 133363968 + ... + 133522919.

It is an arithmetic number, because the mean of its divisors is an integer number (1064878683120).

Almost surely, 2^{21211102231212} is an apocalyptic number.

It is an amenable number.

21211102231212 is an abundant number, since it is smaller than the sum of its proper divisors (29903074558548).

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

21211102231212 is a wasteful number, since it uses less digits than its factorization.

21211102231212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266887110 (or 266887108 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 21.

Adding to 21211102231212 its reverse (21213220111212), we get a palindrome (42424322342424).

The spelling of 21211102231212 in words is "twenty-one trillion, two hundred eleven billion, one hundred two million, two hundred thirty-one thousand, two hundred twelve".