21220311100 has 36 divisors (see below), whose sum is σ = 46110547000. Its totient is φ = 8476608960.

The previous prime is 21220311061. The next prime is 21220311109. The reversal of 21220311100 is 111302212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220311109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69675 + ... + 217474.

Almost surely, 2^21220311100 is an apocalyptic number.

21220311100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220311100 is an abundant number, since it is smaller than the sum of its proper divisors (24890235900).

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

21220311100 is a wasteful number, since it uses less digits than its factorization.

21220311100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287902 (or 287895 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21220311100 its reverse (111302212), we get a palindrome (21331613312).

The spelling of 21220311100 in words is "twenty-one billion, two hundred twenty million, three hundred eleven thousand, one hundred".