21002001221212 has 48 divisors (see below), whose sum is σ = 40418113462272. Its totient is φ = 9469396601280.

The previous prime is 21002001221177. The next prime is 21002001221233. The reversal of 21002001221212 is 21212210020012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29278798 + ... + 29987530.

It is an arithmetic number, because the mean of its divisors is an integer number (842044030464).

Almost surely, 2^{21002001221212} is an apocalyptic number.

21002001221212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21002001221212 is a deficient number, since it is larger than the sum of its proper divisors (19416112241060).

21002001221212 is a wasteful number, since it uses less digits than its factorization.

21002001221212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 714178 (or 714176 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21002001221212 its reverse (21212210020012), we get a palindrome (42214211241224).

It can be divided in two parts, 210020012 and 21212, that multiplied together give a palindrome (4454944494544).

The spelling of 21002001221212 in words is "twenty-one trillion, two billion, one million, two hundred twenty-one thousand, two hundred twelve".