21111202022020 has 48 divisors (see below), whose sum is σ = 51208776678528. Its totient is φ = 7225224220160.

The previous prime is 21111202021919. The next prime is 21111202022021. The reversal of 21111202022020 is 2022020211112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21111202021985 and 21111202022003.

It is not an unprimeable number, because it can be changed into a prime (21111202022021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2822349472 + ... + 2822356951.

It is an arithmetic number, because the mean of its divisors is an integer number (1066849514136).

Almost surely, 2^{21111202022020} is an apocalyptic number.

21111202022020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21111202022020 is an abundant number, since it is smaller than the sum of its proper divisors (30097574656508).

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

21111202022020 is a wasteful number, since it uses less digits than its factorization.

21111202022020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5644706460 (or 5644706458 counting only the distinct ones).

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

Adding to 21111202022020 its reverse (2022020211112), we get a palindrome (23133222233132).

The spelling of 21111202022020 in words is "twenty-one trillion, one hundred eleven billion, two hundred two million, twenty-two thousand, twenty".