21221200102212 has 48 divisors (see below), whose sum is σ = 60019555848000. Its totient is φ = 6430666697280.

The previous prime is 21221200102211. The next prime is 21221200102213. The reversal of 21221200102212 is 21220100212212.

It is a happy number.

21221200102212 is a `hidden beast` number, since 21 + 221 + 200 + 1 + 0 + 221 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (21221200102211) and next prime (21221200102213).

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 (21221200102211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8931480337 + ... + 8931482712.

It is an arithmetic number, because the mean of its divisors is an integer number (1250407413500).

Almost surely, 2^{21221200102212} is an apocalyptic number.

21221200102212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21221200102212 is an abundant number, since it is smaller than the sum of its proper divisors (38798355745788).

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

21221200102212 is a wasteful number, since it uses less digits than its factorization.

21221200102212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17862963073 (or 17862963065 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21221200102212 its reverse (21220100212212), we get a palindrome (42441300314424).

The spelling of 21221200102212 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred million, one hundred two thousand, two hundred twelve".