205421031222 has 64 divisors (see below), whose sum is σ = 454351887360. Its totient is φ = 61394860800.

The previous prime is 205421031203. The next prime is 205421031223. The reversal of 205421031222 is 222130124502.

It is a junction number, because it is equal to n+sod(n) for n = 205421031192 and 205421031201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205421031223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4948272 + ... + 4989612.

It is an arithmetic number, because the mean of its divisors is an integer number (7099248240).

Almost surely, 2^205421031222 is an apocalyptic number.

205421031222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 205421031222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (227175943680).

205421031222 is an abundant number, since it is smaller than the sum of its proper divisors (248930856138).

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

205421031222 is a wasteful number, since it uses less digits than its factorization.

205421031222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42389.

The product of its (nonzero) digits is 1920, while the sum is 24.

Adding to 205421031222 its reverse (222130124502), we get a palindrome (427551155724).

The spelling of 205421031222 in words is "two hundred five billion, four hundred twenty-one million, thirty-one thousand, two hundred twenty-two".