221011221200020 has 24 divisors (see below), whose sum is σ = 466528349836584. Its totient is φ = 87946434134016.

The previous prime is 221011221199999. The next prime is 221011221200059. The reversal of 221011221200020 is 20002122110122.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 327955510276 + 220683265689744 = 572674^2 + 14855412^2 .

It is a junction number, because it is equal to n+sod(n) for n = 221011221199967 and 221011221200003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28628392669 + ... + 28628400388.

It is an arithmetic number, because the mean of its divisors is an integer number (19438681243191).

Almost surely, 2^{221011221200020} is an apocalyptic number.

221011221200020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221011221200020 is an abundant number, since it is smaller than the sum of its proper divisors (245517128636564).

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

221011221200020 is a wasteful number, since it uses less digits than its factorization.

221011221200020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57256793259 (or 57256793257 counting only the distinct ones).

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

Adding to 221011221200020 its reverse (20002122110122), we get a palindrome (241013343310142).

The spelling of 221011221200020 in words is "two hundred twenty-one trillion, eleven billion, two hundred twenty-one million, two hundred thousand, twenty".