221303211031221 has 64 divisors (see below), whose sum is σ = 344073215646720. Its totient is φ = 125032989864960.

The previous prime is 221303211031211. The next prime is 221303211031223. The reversal of 221303211031221 is 122130112303122.

It is not a de Polignac number, because 221303211031221 - 2¹⁵ = 221303210998453 is a prime.

It is a super-2 number, since 2×221303211031221² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221303211031191 and 221303211031200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221303211031223) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 363879975 + ... + 364487643.

It is an arithmetic number, because the mean of its divisors is an integer number (5376143994480).

Almost surely, 2^{221303211031221} is an apocalyptic number.

It is an amenable number.

221303211031221 is a deficient number, since it is larger than the sum of its proper divisors (122770004615499).

221303211031221 is a wasteful number, since it uses less digits than its factorization.

221303211031221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613874.

The product of its (nonzero) digits is 864, while the sum is 24.

Adding to 221303211031221 its reverse (122130112303122), we get a palindrome (343433323334343).

The spelling of 221303211031221 in words is "two hundred twenty-one trillion, three hundred three billion, two hundred eleven million, thirty-one thousand, two hundred twenty-one".