21021022212212 has 48 divisors (see below), whose sum is σ = 40777953249600. Its totient is φ = 9402182361600.

The previous prime is 21021022212209. The next prime is 21021022212217. The reversal of 21021022212212 is 21221222012012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021022212217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14281589 + ... + 15684572.

It is an arithmetic number, because the mean of its divisors is an integer number (849540692700).

Almost surely, 2^{21021022212212} is an apocalyptic number.

21021022212212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21021022212212 is a deficient number, since it is larger than the sum of its proper divisors (19756931037388).

21021022212212 is a wasteful number, since it uses less digits than its factorization.

21021022212212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29966432 (or 29966430 counting only the distinct ones).

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

Adding to 21021022212212 its reverse (21221222012012), we get a palindrome (42242244224224).

It can be divided in two parts, 210210 and 22212212, that added together give a palindrome (22422422).

The spelling of 21021022212212 in words is "twenty-one trillion, twenty-one billion, twenty-two million, two hundred twelve thousand, two hundred twelve".