221001111020021 has 8 divisors (see below), whose sum is σ = 221251928808960. Its totient is φ = 220750308995328.

The previous prime is 221001111020009. The next prime is 221001111020077. The reversal of 221001111020021 is 120020111100122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221001111020021 - 2¹⁸ = 221001110757877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221001111019978 and 221001111020005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221001111020321) 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, 24227285 + ... + 32077461.

It is an arithmetic number, because the mean of its divisors is an integer number (27656491101120).

Almost surely, 2^{221001111020021} is an apocalyptic number.

It is an amenable number.

221001111020021 is a deficient number, since it is larger than the sum of its proper divisors (250817788939).

221001111020021 is an equidigital number, since it uses as much as digits as its factorization.

221001111020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7882123.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 221001111020021 its reverse (120020111100122), we get a palindrome (341021222120143).

The spelling of 221001111020021 in words is "two hundred twenty-one trillion, one billion, one hundred eleven million, twenty thousand, twenty-one".