1321122110220 has 72 divisors (see below), whose sum is σ = 4371713171280. Its totient is φ = 320272026240.

The previous prime is 1321122110177. The next prime is 1321122110221. The reversal of 1321122110220 is 220112211231.

1321122110220 is a `hidden beast` number, since 1 + 3 + 211 + 221 + 10 + 220 = 666.

It is a super-2 number, since 2×1321122110220² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1321122110193 and 1321122110202.

It is not an unprimeable number, because it can be changed into a prime (1321122110221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 333614715 + ... + 333618674.

It is an arithmetic number, because the mean of its divisors is an integer number (60718238490).

Almost surely, 2^{1321122110220} is an apocalyptic number.

1321122110220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321122110220 is an abundant number, since it is smaller than the sum of its proper divisors (3050591061060).

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

1321122110220 is a wasteful number, since it uses less digits than its factorization.

1321122110220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667233415 (or 667233410 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 1321122110220 its reverse (220112211231), we get a palindrome (1541234321451).

The spelling of 1321122110220 in words is "one trillion, three hundred twenty-one billion, one hundred twenty-two million, one hundred ten thousand, two hundred twenty".