2001212011021 has 4 divisors (see below), whose sum is σ = 2006664905152. Its totient is φ = 1995759116892.

The previous prime is 2001212011003. The next prime is 2001212011067. The reversal of 2001212011021 is 1201102121002.

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 2001212011021 - 2²¹ = 2001209913869 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2001212010992 and 2001212011010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001212011321) 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, 2726446515 + ... + 2726447248.

It is an arithmetic number, because the mean of its divisors is an integer number (501666226288).

Almost surely, 2^{2001212011021} is an apocalyptic number.

It is an amenable number.

2001212011021 is a deficient number, since it is larger than the sum of its proper divisors (5452894131).

2001212011021 is an equidigital number, since it uses as much as digits as its factorization.

2001212011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5452894130.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 2001212011021 its reverse (1201102121002), we get a palindrome (3202314132023).

The spelling of 2001212011021 in words is "two trillion, one billion, two hundred twelve million, eleven thousand, twenty-one".