221240421100121 has 4 divisors (see below), whose sum is σ = 221601335327652. Its totient is φ = 220879506872592.

The previous prime is 221240421100043. The next prime is 221240421100123. The reversal of 221240421100121 is 121001124042122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19263882796096 + 201976538304025 = 4389064^2 + 14211845^2 .

It is a cyclic number.

It is not a de Polignac number, because 221240421100121 - 2⁴⁶ = 150871676922457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221240421100123) 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, 180457112846 + ... + 180457114071.

It is an arithmetic number, because the mean of its divisors is an integer number (55400333831913).

Almost surely, 2^{221240421100121} is an apocalyptic number.

It is an amenable number.

221240421100121 is a deficient number, since it is larger than the sum of its proper divisors (360914227531).

221240421100121 is an equidigital number, since it uses as much as digits as its factorization.

221240421100121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360914227530.

The product of its (nonzero) digits is 512, while the sum is 23.

Adding to 221240421100121 its reverse (121001124042122), we get a palindrome (342241545142243).

The spelling of 221240421100121 in words is "two hundred twenty-one trillion, two hundred forty billion, four hundred twenty-one million, one hundred thousand, one hundred twenty-one".