21220212101020 has 48 divisors (see below), whose sum is σ = 44929143963648. Its totient is φ = 8418284562240.

The previous prime is 21220212100957. The next prime is 21220212101029. The reversal of 21220212101020 is 2010121202212.

It is a happy number.

It is a super-2 number, since 2×21220212101020² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21220212100985 and 21220212101003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220212101029) 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, 5751925 + ... + 8690515.

It is an arithmetic number, because the mean of its divisors is an integer number (936023832576).

Almost surely, 2^{21220212101020} is an apocalyptic number.

21220212101020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220212101020 is an abundant number, since it is smaller than the sum of its proper divisors (23708931862628).

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

21220212101020 is a wasteful number, since it uses less digits than its factorization.

21220212101020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2941570 (or 2941568 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21220212101020 its reverse (2010121202212), we get a palindrome (23230333303232).

The spelling of 21220212101020 in words is "twenty-one trillion, two hundred twenty billion, two hundred twelve million, one hundred one thousand, twenty".