21022101100 has 144 divisors (see below), whose sum is σ = 61249579776. Its totient is φ = 6048288000.

The previous prime is 21022101097. The next prime is 21022101103. The reversal of 21022101100 is 110122012.

It is an interprime number because it is at equal distance from previous prime (21022101097) and next prime (21022101103).

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (21022101103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4906 + ... + 205105.

It is an arithmetic number, because the mean of its divisors is an integer number (425344304).

Almost surely, 2^21022101100 is an apocalyptic number.

21022101100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21022101100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30624789888).

21022101100 is an abundant number, since it is smaller than the sum of its proper divisors (40227478676).

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

21022101100 is a wasteful number, since it uses less digits than its factorization.

21022101100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210056 (or 210049 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21022101100 its reverse (110122012), we get a palindrome (21132223112).

The spelling of 21022101100 in words is "twenty-one billion, twenty-two million, one hundred one thousand, one hundred".