21111002222020 has 24 divisors (see below), whose sum is σ = 45414399903768. Its totient is φ = 8238439891200.

The previous prime is 21111002221889. The next prime is 21111002222029. The reversal of 21111002222020 is 2022220011112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 169157818944 + 20941844403076 = 411288^2 + 4576226^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21111002221985 and 21111002222003.

It is not an unprimeable number, because it can be changed into a prime (21111002222029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12872561511 + ... + 12872563150.

It is an arithmetic number, because the mean of its divisors is an integer number (1892266662657).

Almost surely, 2^{21111002222020} is an apocalyptic number.

21111002222020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21111002222020 is an abundant number, since it is smaller than the sum of its proper divisors (24303397681748).

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

21111002222020 is a wasteful number, since it uses less digits than its factorization.

21111002222020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25745124711 (or 25745124709 counting only the distinct ones).

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

Adding to 21111002222020 its reverse (2022220011112), we get a palindrome (23133222233132).

The spelling of 21111002222020 in words is "twenty-one trillion, one hundred eleven billion, two million, two hundred twenty-two thousand, twenty".