21112221002020 has 48 divisors (see below), whose sum is σ = 46972857536640. Its totient is φ = 7943184111104.

The previous prime is 21112221001973. The next prime is 21112221002027. The reversal of 21112221002020 is 2020012221112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21112221001985 and 21112221002003.

It is not an unprimeable number, because it can be changed into a prime (21112221002027) 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, 18773710 + ... + 19866469.

It is an arithmetic number, because the mean of its divisors is an integer number (978601198680).

Almost surely, 2^{21112221002020} is an apocalyptic number.

21112221002020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21112221002020 is an abundant number, since it is smaller than the sum of its proper divisors (25860636534620).

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

21112221002020 is a wasteful number, since it uses less digits than its factorization.

21112221002020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38641812 (or 38641810 counting only the distinct ones).

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

Adding to 21112221002020 its reverse (2020012221112), we get a palindrome (23132233223132).

The spelling of 21112221002020 in words is "twenty-one trillion, one hundred twelve billion, two hundred twenty-one million, two thousand, twenty".