21210244201212 has 96 divisors (see below), whose sum is σ = 55472310507264. Its totient is φ = 6250993689600.

The previous prime is 21210244201207. The next prime is 21210244201219.

21210244201212 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210244201219) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10664148 + ... + 12495780.

It is an arithmetic number, because the mean of its divisors is an integer number (577836567784).

Almost surely, 2^{21210244201212} is an apocalyptic number.

21210244201212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21210244201212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27736155253632).

21210244201212 is an abundant number, since it is smaller than the sum of its proper divisors (34262066306052).

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

21210244201212 is a wasteful number, since it uses less digits than its factorization.

21210244201212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1834059 (or 1834057 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 24.

It can be divided in two parts, 2121024 and 4201212, that added together give a palindrome (6322236).

The spelling of 21210244201212 in words is "twenty-one trillion, two hundred ten billion, two hundred forty-four million, two hundred one thousand, two hundred twelve".