21210111101212 has 72 divisors (see below), whose sum is σ = 41472986034816. Its totient is φ = 9411046680000.

The previous prime is 21210111101203. The next prime is 21210111101227.

21210111101212 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31535143 + ... + 32200705.

It is an arithmetic number, because the mean of its divisors is an integer number (576013694928).

Almost surely, 2^{21210111101212} is an apocalyptic number.

21210111101212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21210111101212 is a deficient number, since it is larger than the sum of its proper divisors (20262874933604).

21210111101212 is a wasteful number, since it uses less digits than its factorization.

21210111101212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 665851 (or 665748 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 16.

It can be divided in two parts, 2121011 and 1101212, that added together give a palindrome (3222223).

The spelling of 21210111101212 in words is "twenty-one trillion, two hundred ten billion, one hundred eleven million, one hundred one thousand, two hundred twelve".