2001121010021 has 8 divisors (see below), whose sum is σ = 2314549602624. Its totient is φ = 1694580958080.

The previous prime is 2001121009997. The next prime is 2001121010023. The reversal of 2001121010021 is 1200101211002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2001121010021 - 2²² = 2001116815717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2001121009984 and 2001121010011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001121010023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1722134540 + ... + 1722135701.

It is an arithmetic number, because the mean of its divisors is an integer number (289318700328).

Almost surely, 2^{2001121010021} is an apocalyptic number.

It is an amenable number.

2001121010021 is a deficient number, since it is larger than the sum of its proper divisors (313428592603).

2001121010021 is an equidigital number, since it uses as much as digits as its factorization.

2001121010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3444270331.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 2001121010021 its reverse (1200101211002), we get a palindrome (3201222221023).

The spelling of 2001121010021 in words is "two trillion, one billion, one hundred twenty-one million, ten thousand, twenty-one".