21020112221020 has 24 divisors (see below), whose sum is σ = 48155166179568. Its totient is φ = 7643677171200.

The previous prime is 21020112220957. The next prime is 21020112221027. The reversal of 21020112221020 is 2012221102012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21020112220985 and 21020112221003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020112221027) 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, 47772982101 + ... + 47772982540.

It is an arithmetic number, because the mean of its divisors is an integer number (2006465257482).

Almost surely, 2^{21020112221020} is an apocalyptic number.

21020112221020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21020112221020 is an abundant number, since it is smaller than the sum of its proper divisors (27135053958548).

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

21020112221020 is a wasteful number, since it uses less digits than its factorization.

21020112221020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95545964661 (or 95545964659 counting only the distinct ones).

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

Adding to 21020112221020 its reverse (2012221102012), we get a palindrome (23032333323032).

The spelling of 21020112221020 in words is "twenty-one trillion, twenty billion, one hundred twelve million, two hundred twenty-one thousand, twenty".