421110221221 has 4 divisors (see below), whose sum is σ = 421113822444. Its totient is φ = 421106620000.

The previous prime is 421110221201. The next prime is 421110221291. The reversal of 421110221221 is 122122011124.

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 346573577025 + 74536644196 = 588705^2 + 273014^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421110221221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421110221201) 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, 1619110 + ... + 1861111.

It is an arithmetic number, because the mean of its divisors is an integer number (105278455611).

Almost surely, 2^421110221221 is an apocalyptic number.

It is an amenable number.

421110221221 is a deficient number, since it is larger than the sum of its proper divisors (3601223).

421110221221 is a wasteful number, since it uses less digits than its factorization.

421110221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3601222.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 421110221221 its reverse (122122011124), we get a palindrome (543232232345).

The spelling of 421110221221 in words is "four hundred twenty-one billion, one hundred ten million, two hundred twenty-one thousand, two hundred twenty-one".