221133211321221 has 40 divisors (see below), whose sum is σ = 334479523334880. Its totient is φ = 145574179384608.

The previous prime is 221133211321219. The next prime is 221133211321223. The reversal of 221133211321221 is 122123112331122.

221133211321221 is a `hidden beast` number, since 2 + 2 + 1 + 1 + 332 + 1 + 1 + 321 + 2 + 2 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (221133211321219) and next prime (221133211321223).

It is not a de Polignac number, because 221133211321221 - 2¹ = 221133211321219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221133211321223) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 5535486 + ... + 21746448.

It is an arithmetic number, because the mean of its divisors is an integer number (8361988083372).

Almost surely, 2^{221133211321221} is an apocalyptic number.

It is an amenable number.

221133211321221 is a deficient number, since it is larger than the sum of its proper divisors (113346312013659).

221133211321221 is a wasteful number, since it uses less digits than its factorization.

221133211321221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16213087 (or 16213078 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

Adding to 221133211321221 its reverse (122123112331122), we get a palindrome (343256323652343).

The spelling of 221133211321221 in words is "two hundred twenty-one trillion, one hundred thirty-three billion, two hundred eleven million, three hundred twenty-one thousand, two hundred twenty-one".