2121021001 has 8 divisors (see below), whose sum is σ = 2327217984. Its totient is φ = 1917053520.

The previous prime is 2121020989. The next prime is 2121021013. The reversal of 2121021001 is 1001201212.

It is an interprime number because it is at equal distance from previous prime (2121020989) and next prime (2121021013).

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 2121021001 - 2¹³ = 2121012809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121321001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 555381 + ... + 559186.

It is an arithmetic number, because the mean of its divisors is an integer number (290902248).

Almost surely, 2^2121021001 is an apocalyptic number.

It is an amenable number.

2121021001 is a deficient number, since it is larger than the sum of its proper divisors (206196983).

2121021001 is a wasteful number, since it uses less digits than its factorization.

2121021001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1114751.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 2121021001 is about 46054.5437606323. The cubic root of 2121021001 is about 1284.8378526346.

Adding to 2121021001 its reverse (1001201212), we get a palindrome (3122222213).

The spelling of 2121021001 in words is "two billion, one hundred twenty-one million, twenty-one thousand, one".