21211010021212 has 96 divisors (see below), whose sum is σ = 43336746593280. Its totient is φ = 8976895979520.

The previous prime is 21211010021171. The next prime is 21211010021221. The reversal of 21211010021212 is 21212001011212.

It is a super-2 number, since 2×21211010021212² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 57361588 + ... + 57730180.

It is an arithmetic number, because the mean of its divisors is an integer number (451424443680).

Almost surely, 2^{21211010021212} is an apocalyptic number.

21211010021212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21211010021212 is an abundant number, since it is smaller than the sum of its proper divisors (22125736572068).

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

21211010021212 is a wasteful number, since it uses less digits than its factorization.

21211010021212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369451 (or 369449 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21211010021212 its reverse (21212001011212), we get a palindrome (42423011032424).

The spelling of 21211010021212 in words is "twenty-one trillion, two hundred eleven billion, ten million, twenty-one thousand, two hundred twelve".