1021221002020 has 12 divisors (see below), whose sum is σ = 2144564104284. Its totient is φ = 408488400800.

The previous prime is 1021221002017. The next prime is 1021221002027. The reversal of 1021221002020 is 202001221201.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 438490298596 + 582730703424 = 662186^2 + 763368^2 .

It is not an unprimeable number, because it can be changed into a prime (1021221002027) 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, 25530525031 + ... + 25530525070.

It is an arithmetic number, because the mean of its divisors is an integer number (178713675357).

Almost surely, 2^{1021221002020} is an apocalyptic number.

1021221002020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021221002020 is an abundant number, since it is smaller than the sum of its proper divisors (1123343102264).

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

1021221002020 is a wasteful number, since it uses less digits than its factorization.

1021221002020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51061050110 (or 51061050108 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 1021221002020 its reverse (202001221201), we get a palindrome (1223222223221).

The spelling of 1021221002020 in words is "one trillion, twenty-one billion, two hundred twenty-one million, two thousand, twenty".