21212220201102 has 80 divisors (see below), whose sum is σ = 55477012377600. Its totient is φ = 5931684661392.

The previous prime is 21212220201101. The next prime is 21212220201119. The reversal of 21212220201102 is 20110202221212.

It is a happy number.

21212220201102 is a `hidden beast` number, since 21 + 212 + 220 + 201 + 10 + 2 = 666.

It is a super-4 number, since 4×21212220201102⁴ (a number of 54 digits) contains 4444 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212220201101) 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 39 ways as a sum of consecutive naturals, for example, 198943102 + ... + 199049697.

It is an arithmetic number, because the mean of its divisors is an integer number (693462654720).

Almost surely, 2^{21212220201102} is an apocalyptic number.

21212220201102 is an abundant number, since it is smaller than the sum of its proper divisors (34264792176498).

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

21212220201102 is a wasteful number, since it uses less digits than its factorization.

21212220201102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397992867 (or 397992858 counting only the distinct ones).

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

Adding to 21212220201102 its reverse (20110202221212), we get a palindrome (41322422422314).

The spelling of 21212220201102 in words is "twenty-one trillion, two hundred twelve billion, two hundred twenty million, two hundred one thousand, one hundred two".