21112020201220 has 48 divisors (see below), whose sum is σ = 47747317101120. Its totient is φ = 7794934574976.

The previous prime is 21112020201191. The next prime is 21112020201277. The reversal of 21112020201220 is 2210202021112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21112020201194 and 21112020201203.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6096499 + ... + 8910181.

It is an arithmetic number, because the mean of its divisors is an integer number (994735772940).

Almost surely, 2^{21112020201220} is an apocalyptic number.

21112020201220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21112020201220 is an abundant number, since it is smaller than the sum of its proper divisors (26635296899900).

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

21112020201220 is a wasteful number, since it uses less digits than its factorization.

21112020201220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2842564 (or 2842562 counting only the distinct ones).

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

Adding to 21112020201220 its reverse (2210202021112), we get a palindrome (23322222222332).

The spelling of 21112020201220 in words is "twenty-one trillion, one hundred twelve billion, twenty million, two hundred one thousand, two hundred twenty".