2001212122020 has 24 divisors (see below), whose sum is σ = 5603393941824. Its totient is φ = 533656565856.

The previous prime is 2001212121973. The next prime is 2001212122139. The reversal of 2001212122020 is 202212121002.

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16676767624 + ... + 16676767743.

It is an arithmetic number, because the mean of its divisors is an integer number (233474747576).

Almost surely, 2^{2001212122020} is an apocalyptic number.

2001212122020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001212122020 is an abundant number, since it is smaller than the sum of its proper divisors (3602181819804).

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

2001212122020 is a wasteful number, since it uses less digits than its factorization.

2001212122020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33353535379 (or 33353535377 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 2001212122020 its reverse (202212121002), we get a palindrome (2203424243022).

The spelling of 2001212122020 in words is "two trillion, one billion, two hundred twelve million, one hundred twenty-two thousand, twenty".