221026121 has 8 divisors (see below), whose sum is σ = 229286400. Its totient is φ = 212902560.

The previous prime is 221026111. The next prime is 221026147. The reversal of 221026121 is 121620122.

221026121 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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221026121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 221026121.

It is not an unprimeable number, because it can be changed into a prime (221026111) 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, 30881 + ... + 37358.

It is an arithmetic number, because the mean of its divisors is an integer number (28660800).

Almost surely, 2^221026121 is an apocalyptic number.

It is an amenable number.

221026121 is a deficient number, since it is larger than the sum of its proper divisors (8260279).

221026121 is an equidigital number, since it uses as much as digits as its factorization.

221026121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68359.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 221026121 is about 14866.9472656628. The cubic root of 221026121 is about 604.6181785863.

Adding to 221026121 its reverse (121620122), we get a palindrome (342646243).

The spelling of 221026121 in words is "two hundred twenty-one million, twenty-six thousand, one hundred twenty-one".