1321122022220 has 288 divisors, whose sum is σ = 3780318796800. Its totient is φ = 377359741440.

The previous prime is 1321122022211. The next prime is 1321122022279. The reversal of 1321122022220 is 222202211231.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1321122022192 and 1321122022201.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 30589001 + ... + 30632159.

Almost surely, 2^{1321122022220} is an apocalyptic number.

1321122022220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1321122022220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1890159398400).

1321122022220 is an abundant number, since it is smaller than the sum of its proper divisors (2459196774580).

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

1321122022220 is a wasteful number, since it uses less digits than its factorization.

1321122022220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43349 (or 43336 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 1321122022220 its reverse (222202211231), we get a palindrome (1543324233451).

The spelling of 1321122022220 in words is "one trillion, three hundred twenty-one billion, one hundred twenty-two million, twenty-two thousand, two hundred twenty".