2001212220020 has 48 divisors (see below), whose sum is σ = 4526692313808. Its totient is φ = 738766448640.

The previous prime is 2001212220013. The next prime is 2001212220061. The reversal of 2001212220020 is 200222121002.

It can be written as a sum of positive squares in 8 ways, for example, as 13038899344 + 1988173320676 = 114188^2 + 1410026^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2001212219977 and 2001212220004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 610700 + ... + 2091740.

It is an arithmetic number, because the mean of its divisors is an integer number (94306089871).

Almost surely, 2^{2001212220020} is an apocalyptic number.

2001212220020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001212220020 is an abundant number, since it is smaller than the sum of its proper divisors (2525480093788).

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

2001212220020 is a wasteful number, since it uses less digits than its factorization.

2001212220020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1486260 (or 1486258 counting only the distinct ones).

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

Adding to 2001212220020 its reverse (200222121002), we get a palindrome (2201434341022).

The spelling of 2001212220020 in words is "two trillion, one billion, two hundred twelve million, two hundred twenty thousand, twenty".