21220100413220 has 48 divisors (see below), whose sum is σ = 44589325652928. Its totient is φ = 8482876955520.

The previous prime is 21220100413129. The next prime is 21220100413223. The reversal of 21220100413220 is 2231400102212.

It is a super-2 number, since 2×21220100413220² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21220100413192 and 21220100413201.

It is not an unprimeable number, because it can be changed into a prime (21220100413223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 243342467 + ... + 243429653.

It is an arithmetic number, because the mean of its divisors is an integer number (928944284436).

Almost surely, 2^{21220100413220} is an apocalyptic number.

21220100413220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220100413220 is an abundant number, since it is smaller than the sum of its proper divisors (23369225239708).

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

21220100413220 is a wasteful number, since it uses less digits than its factorization.

21220100413220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94460 (or 94458 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21220100413220 its reverse (2231400102212), we get a palindrome (23451500515432).

The spelling of 21220100413220 in words is "twenty-one trillion, two hundred twenty billion, one hundred million, four hundred thirteen thousand, two hundred twenty".