221020021112020 has 48 divisors (see below), whose sum is σ = 499858457793408. Its totient is φ = 81605240691840.

The previous prime is 221020021111921. The next prime is 221020021112039. The reversal of 221020021112020 is 20211120020122.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 221020021111985 and 221020021112003.

It is a congruent number.

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, 1310214 + ... + 21065533.

It is an arithmetic number, because the mean of its divisors is an integer number (10413717870696).

Almost surely, 2^{221020021112020} is an apocalyptic number.

221020021112020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221020021112020 is an abundant number, since it is smaller than the sum of its proper divisors (278838436681388).

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

221020021112020 is a wasteful number, since it uses less digits than its factorization.

221020021112020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22413760 (or 22413758 counting only the distinct ones).

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

Adding to 221020021112020 its reverse (20211120020122), we get a palindrome (241231141132142).

The spelling of 221020021112020 in words is "two hundred twenty-one trillion, twenty billion, twenty-one million, one hundred twelve thousand, twenty".