21220002222100 has 36 divisors (see below), whose sum is σ = 50233532535648. Its totient is φ = 7716364444000.

The previous prime is 21220002222071. The next prime is 21220002222119. The reversal of 21220002222100 is 122220002212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9645454456 + ... + 9645456655.

It is an arithmetic number, because the mean of its divisors is an integer number (1395375903768).

Almost surely, 2^{21220002222100} is an apocalyptic number.

21220002222100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220002222100 is an abundant number, since it is smaller than the sum of its proper divisors (29013530313548).

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

21220002222100 is a wasteful number, since it uses less digits than its factorization.

21220002222100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19290911136 (or 19290911129 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21220002222100 its reverse (122220002212), we get a palindrome (21342222224312).

The spelling of 21220002222100 in words is "twenty-one trillion, two hundred twenty billion, two million, two hundred twenty-two thousand, one hundred".