2001220002121 has 16 divisors (see below), whose sum is σ = 2024725248000. Its totient is φ = 1977877742400.

The previous prime is 2001220002113. The next prime is 2001220002137. The reversal of 2001220002121 is 1212000221002.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2001220002121 - 2³ = 2001220002113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001220002181) 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, 27006880 + ... + 27080878.

It is an arithmetic number, because the mean of its divisors is an integer number (126545328000).

Almost surely, 2^{2001220002121} is an apocalyptic number.

It is an amenable number.

2001220002121 is a deficient number, since it is larger than the sum of its proper divisors (23505245879).

2001220002121 is a wasteful number, since it uses less digits than its factorization.

2001220002121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75096.

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

Adding to 2001220002121 its reverse (1212000221002), we get a palindrome (3213220223123).

The spelling of 2001220002121 in words is "two trillion, one billion, two hundred twenty million, two thousand, one hundred twenty-one".