21220101100100 has 72 divisors (see below), whose sum is σ = 52689333291840. Its totient is φ = 7266686843520.

The previous prime is 21220101100091. The next prime is 21220101100141. The reversal of 21220101100100 is 100110102212.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17703434 + ... + 18864033.

It is an arithmetic number, because the mean of its divisors is an integer number (731796295720).

Almost surely, 2^{21220101100100} is an apocalyptic number.

21220101100100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220101100100 is an abundant number, since it is smaller than the sum of its proper divisors (31469232191740).

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

21220101100100 is a wasteful number, since it uses less digits than its factorization.

21220101100100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36568317 (or 36568310 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21220101100100 its reverse (100110102212), we get a palindrome (21320211202312).

The spelling of 21220101100100 in words is "twenty-one trillion, two hundred twenty billion, one hundred one million, one hundred thousand, one hundred".