21101220222200 has 48 divisors (see below), whose sum is σ = 49069436564880. Its totient is φ = 8438922575360.

The previous prime is 21101220222179. The next prime is 21101220222211. The reversal of 21101220222200 is 222202210112.

It is a happy number.

It is a super-2 number, since 2×21101220222200² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8703164 + ... + 10860363.

It is an arithmetic number, because the mean of its divisors is an integer number (1022279928435).

Almost surely, 2^{21101220222200} is an apocalyptic number.

21101220222200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21101220222200 is an abundant number, since it is smaller than the sum of its proper divisors (27968216342680).

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

21101220222200 is a wasteful number, since it uses less digits than its factorization.

21101220222200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19568936 (or 19568927 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21101220222200 its reverse (222202210112), we get a palindrome (21323422432312).

The spelling of 21101220222200 in words is "twenty-one trillion, one hundred one billion, two hundred twenty million, two hundred twenty-two thousand, two hundred".