1021120220 has 12 divisors (see below), whose sum is σ = 2144352504. Its totient is φ = 408448080.

The previous prime is 1021120187. The next prime is 1021120223. The reversal of 1021120220 is 220211201.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021120223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25527986 + ... + 25528025.

It is an arithmetic number, because the mean of its divisors is an integer number (178696042).

Almost surely, 2^1021120220 is an apocalyptic number.

1021120220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021120220 is an abundant number, since it is smaller than the sum of its proper divisors (1123232284).

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

1021120220 is a wasteful number, since it uses less digits than its factorization.

1021120220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51056020 (or 51056018 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1021120220 is about 31954.9717571460. The cubic root of 1021120220 is about 1006.9910841783.

Adding to 1021120220 its reverse (220211201), we get a palindrome (1241331421).

The spelling of 1021120220 in words is "one billion, twenty-one million, one hundred twenty thousand, two hundred twenty".