221101210120021 has 8 divisors (see below), whose sum is σ = 275658651578304. Its totient is φ = 172286657236320.

The previous prime is 221101210119899. The next prime is 221101210120027. The reversal of 221101210120021 is 120021012101122.

221101210120021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 221101210120021 - 2⁷ = 221101210119893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221101210119977 and 221101210120004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221101210120027) 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, 1435722143560 + ... + 1435722143713.

It is an arithmetic number, because the mean of its divisors is an integer number (34457331447288).

Almost surely, 2^{221101210120021} is an apocalyptic number.

It is an amenable number.

221101210120021 is a deficient number, since it is larger than the sum of its proper divisors (54557441458283).

221101210120021 is a wasteful number, since it uses less digits than its factorization.

221101210120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2871444287291.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 221101210120021 its reverse (120021012101122), we get a palindrome (341122222221143).

The spelling of 221101210120021 in words is "two hundred twenty-one trillion, one hundred one billion, two hundred ten million, one hundred twenty thousand, twenty-one".