2001022212021 has 16 divisors (see below), whose sum is σ = 3049952899200. Its totient is φ = 1143150190848.

The previous prime is 2001022212019. The next prime is 2001022212037. The reversal of 2001022212021 is 1202122201002.

It is not a de Polignac number, because 2001022212021 - 2¹ = 2001022212019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001022212001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12043576 + ... + 12208593.

It is an arithmetic number, because the mean of its divisors is an integer number (190622056200).

Almost surely, 2^{2001022212021} is an apocalyptic number.

2001022212021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2001022212021 is a deficient number, since it is larger than the sum of its proper divisors (1048930687179).

2001022212021 is a wasteful number, since it uses less digits than its factorization.

2001022212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24256108.

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

Adding to 2001022212021 its reverse (1202122201002), we get a palindrome (3203144413023).

The spelling of 2001022212021 in words is "two trillion, one billion, twenty-two million, two hundred twelve thousand, twenty-one".