221211022332144 has 80 divisors (see below), whose sum is σ = 616809619907712. Its totient is φ = 67911284423424.

The previous prime is 221211022332143. The next prime is 221211022332371. The reversal of 221211022332144 is 441233220112122.

It is a super-2 number, since 2×221211022332144² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221211022332143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 399841902 + ... + 400394765.

Almost surely, 2^{221211022332144} is an apocalyptic number.

221211022332144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

221211022332144 is an abundant number, since it is smaller than the sum of its proper divisors (395598597575568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221211022332144 is a wasteful number, since it uses less digits than its factorization.

221211022332144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800237134 (or 800237128 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 30.

Adding to 221211022332144 its reverse (441233220112122), we get a palindrome (662444242444266).

The spelling of 221211022332144 in words is "two hundred twenty-one trillion, two hundred eleven billion, twenty-two million, three hundred thirty-two thousand, one hundred forty-four".