21220100101020 has 48 divisors (see below), whose sum is σ = 59479022026368. Its totient is φ = 5652717956160.

The previous prime is 21220100101019. The next prime is 21220100101139. The reversal of 21220100101020 is 2010100102212.

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

It is a junction number, because it is equal to n+sod(n) for n = 21220100100987 and 21220100101005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 186674086 + ... + 186787725.

It is an arithmetic number, because the mean of its divisors is an integer number (1239146292216).

Almost surely, 2^{21220100101020} is an apocalyptic number.

21220100101020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220100101020 is an abundant number, since it is smaller than the sum of its proper divisors (38258921925348).

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

21220100101020 is a wasteful number, since it uses less digits than its factorization.

21220100101020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373462770 (or 373462768 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21220100101020 its reverse (2010100102212), we get a palindrome (23230200203232).

The spelling of 21220100101020 in words is "twenty-one trillion, two hundred twenty billion, one hundred million, one hundred one thousand, twenty".