2001222101021 has 16 divisors (see below), whose sum is σ = 2353285616640. Its totient is φ = 1677776137920.

The previous prime is 2001222100987. The next prime is 2001222101063. The reversal of 2001222101021 is 1201012221002.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2001222101021 is a prime.

It is a super-2 number, since 2×2001222101021² (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 = 2001222100987 and 2001222101005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001222101621) 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, 6392765 + ... + 6698498.

It is an arithmetic number, because the mean of its divisors is an integer number (147080351040).

Almost surely, 2^{2001222101021} is an apocalyptic number.

It is an amenable number.

2001222101021 is a deficient number, since it is larger than the sum of its proper divisors (352063515619).

2001222101021 is a wasteful number, since it uses less digits than its factorization.

2001222101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13092356.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 2001222101021 its reverse (1201012221002), we get a palindrome (3202234322023).

The spelling of 2001222101021 in words is "two trillion, one billion, two hundred twenty-two million, one hundred one thousand, twenty-one".