21220101300 has 72 divisors (see below), whose sum is σ = 64066274496. Its totient is φ = 5412661760.

The previous prime is 21220101271. The next prime is 21220101367. The reversal of 21220101300 is 310102212.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

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, 1530789 + ... + 1544588.

It is an arithmetic number, because the mean of its divisors is an integer number (889809368).

Almost surely, 2^21220101300 is an apocalyptic number.

21220101300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220101300 is an abundant number, since it is smaller than the sum of its proper divisors (42846173196).

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

21220101300 is a wasteful number, since it uses less digits than its factorization.

21220101300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3075417 (or 3075410 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21220101300 its reverse (310102212), we get a palindrome (21530203512).

The spelling of 21220101300 in words is "twenty-one billion, two hundred twenty million, one hundred one thousand, three hundred".