221222121010221 has 8 divisors (see below), whose sum is σ = 294962984458240. Its totient is φ = 147481335784512.

The previous prime is 221222121010213. The next prime is 221222121010229. The reversal of 221222121010221 is 122010121222122.

It is an interprime number because it is at equal distance from previous prime (221222121010213) and next prime (221222121010229).

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

It is not a de Polignac number, because 221222121010221 - 2³ = 221222121010213 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 (221222121010229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12603565 + ... + 24521298.

It is an arithmetic number, because the mean of its divisors is an integer number (36870373057280).

Almost surely, 2^{221222121010221} is an apocalyptic number.

It is an amenable number.

221222121010221 is a deficient number, since it is larger than the sum of its proper divisors (73740863448019).

221222121010221 is a wasteful number, since it uses less digits than its factorization.

221222121010221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39111155.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 221222121010221 its reverse (122010121222122), we get a palindrome (343232242232343).

The spelling of 221222121010221 in words is "two hundred twenty-one trillion, two hundred twenty-two billion, one hundred twenty-one million, ten thousand, two hundred twenty-one".