21121010122212 has 192 divisors, whose sum is σ = 73521465292800. Its totient is φ = 5063978424960.

The previous prime is 21121010122189. The next prime is 21121010122217. The reversal of 21121010122212 is 21222101012112.

21121010122212 is a `hidden beast` number, since 211 + 210 + 10 + 1 + 22 + 212 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21121010122217) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 97576662 + ... + 97792877.

It is an arithmetic number, because the mean of its divisors is an integer number (382924298400).

Almost surely, 2^{21121010122212} is an apocalyptic number.

21121010122212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21121010122212 is an abundant number, since it is smaller than the sum of its proper divisors (52400455170588).

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

21121010122212 is a wasteful number, since it uses less digits than its factorization.

21121010122212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195369583 (or 195369575 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21121010122212 its reverse (21222101012112), we get a palindrome (42343111134324).

The spelling of 21121010122212 in words is "twenty-one trillion, one hundred twenty-one billion, ten million, one hundred twenty-two thousand, two hundred twelve".