21212022021212 has 24 divisors (see below), whose sum is σ = 40896625723632. Its totient is φ = 9546364544000.

The previous prime is 21212022021163. The next prime is 21212022021221.

21212022021212 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 7 ways as a sum of consecutive naturals, for example, 2386586693 + ... + 2386595580.

It is an arithmetic number, because the mean of its divisors is an integer number (1704026071818).

Almost surely, 2^{21212022021212} is an apocalyptic number.

21212022021212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21212022021212 is a deficient number, since it is larger than the sum of its proper divisors (19684603702420).

21212022021212 is a wasteful number, since it uses less digits than its factorization.

21212022021212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4773182389 (or 4773182387 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

It can be divided in two parts, 2121202 and 2021212, that added together give a palindrome (4142414).

The spelling of 21212022021212 in words is "twenty-one trillion, two hundred twelve billion, twenty-two million, twenty-one thousand, two hundred twelve".