2001220122020 has 36 divisors (see below), whose sum is σ = 4888694871900. Its totient is φ = 686132612928.

The previous prime is 2001220121963. The next prime is 2001220122043. The reversal of 2001220122020 is 202210221002.

It can be written as a sum of positive squares in 2 ways, for example, as 919466196544 + 1081753925476 = 958888^2 + 1040074^2 .

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 2001220121986 and 2001220122004.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1021029695 + ... + 1021031654.

It is an arithmetic number, because the mean of its divisors is an integer number (135797079775).

Almost surely, 2^{2001220122020} is an apocalyptic number.

2001220122020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001220122020 is an abundant number, since it is smaller than the sum of its proper divisors (2887474749880).

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

2001220122020 is a wasteful number, since it uses less digits than its factorization.

2001220122020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2042061372 (or 2042061363 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 2001220122020 its reverse (202210221002), we get a palindrome (2203430343022).

The spelling of 2001220122020 in words is "two trillion, one billion, two hundred twenty million, one hundred twenty-two thousand, twenty".