221221120101 has 4 divisors (see below), whose sum is σ = 294961493472. Its totient is φ = 147480746732.

The previous prime is 221221120069. The next prime is 221221120111. The reversal of 221221120101 is 101021122122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221221120101 - 2⁵ = 221221120069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221221120111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36870186681 + ... + 36870186686.

It is an arithmetic number, because the mean of its divisors is an integer number (73740373368).

Almost surely, 2^221221120101 is an apocalyptic number.

It is an amenable number.

221221120101 is a deficient number, since it is larger than the sum of its proper divisors (73740373371).

221221120101 is an equidigital number, since it uses as much as digits as its factorization.

221221120101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73740373370.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221221120101 its reverse (101021122122), we get a palindrome (322242242223).

The spelling of 221221120101 in words is "two hundred twenty-one billion, two hundred twenty-one million, one hundred twenty thousand, one hundred one".