221311210203221 has 8 divisors (see below), whose sum is σ = 222154316461440. Its totient is φ = 220468116208912.

The previous prime is 221311210203217. The next prime is 221311210203247. The reversal of 221311210203221 is 122302012113122.

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

It is a cyclic number.

It is not a de Polignac number, because 221311210203221 - 2² = 221311210203217 is a prime.

It is a super-2 number, since 2×221311210203221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221311210223221) 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, 33943520 + ... + 39934758.

It is an arithmetic number, because the mean of its divisors is an integer number (27769289557680).

Almost surely, 2^{221311210203221} is an apocalyptic number.

It is an amenable number.

221311210203221 is a deficient number, since it is larger than the sum of its proper divisors (843106258219).

221311210203221 is a wasteful number, since it uses less digits than its factorization.

221311210203221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6131955.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 221311210203221 its reverse (122302012113122), we get a palindrome (343613222316343).

The spelling of 221311210203221 in words is "two hundred twenty-one trillion, three hundred eleven billion, two hundred ten million, two hundred three thousand, two hundred twenty-one".