2001200221021 has 4 divisors (see below), whose sum is σ = 2001222561600. Its totient is φ = 2001177880444.

The previous prime is 2001200220973. The next prime is 2001200221043. The reversal of 2001200221021 is 1201220021002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2001200221021 - 2²³ = 2001191832413 is a prime.

It is a super-2 number, since 2×2001200221021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2001200220992 and 2001200221010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001200221091) 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, 11035381 + ... + 11215258.

It is an arithmetic number, because the mean of its divisors is an integer number (500305640400).

Almost surely, 2^{2001200221021} is an apocalyptic number.

It is an amenable number.

2001200221021 is a deficient number, since it is larger than the sum of its proper divisors (22340579).

2001200221021 is an equidigital number, since it uses as much as digits as its factorization.

2001200221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22340578.

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

Adding to 2001200221021 its reverse (1201220021002), we get a palindrome (3202420242023).

The spelling of 2001200221021 in words is "two trillion, one billion, two hundred million, two hundred twenty-one thousand, twenty-one".