1021121102220 has 96 divisors (see below), whose sum is σ = 2887120454400. Its totient is φ = 269644157184.

The previous prime is 1021121102219. The next prime is 1021121102317. The reversal of 1021121102220 is 222011211201.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1021121102220.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3086887 + ... + 3401633.

It is an arithmetic number, because the mean of its divisors is an integer number (30074171400).

Almost surely, 2^{1021121102220} is an apocalyptic number.

1021121102220 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 1021121102220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1443560227200).

1021121102220 is an abundant number, since it is smaller than the sum of its proper divisors (1865999352180).

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

1021121102220 is a wasteful number, since it uses less digits than its factorization.

1021121102220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315287 (or 315285 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1021121102220 its reverse (222011211201), we get a palindrome (1243132313421).

The spelling of 1021121102220 in words is "one trillion, twenty-one billion, one hundred twenty-one million, one hundred two thousand, two hundred twenty".