21220100123020 has 96 divisors (see below), whose sum is σ = 46187293824000. Its totient is φ = 8185310918400.

The previous prime is 21220100123011. The next prime is 21220100123051. The reversal of 21220100123020 is 2032100102212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21220100122985 and 21220100123003.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14820681 + ... + 16189279.

It is an arithmetic number, because the mean of its divisors is an integer number (481117644000).

Almost surely, 2^{21220100123020} is an apocalyptic number.

21220100123020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220100123020 is an abundant number, since it is smaller than the sum of its proper divisors (24967193700980).

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

21220100123020 is a wasteful number, since it uses less digits than its factorization.

21220100123020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1368919 (or 1368917 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21220100123020 its reverse (2032100102212), we get a palindrome (23252200225232).

The spelling of 21220100123020 in words is "twenty-one trillion, two hundred twenty billion, one hundred million, one hundred twenty-three thousand, twenty".