2121311511001 has 8 divisors (see below), whose sum is σ = 2164476569544. Its totient is φ = 2078417080320.

The previous prime is 2121311510999. The next prime is 2121311511031. The reversal of 2121311511001 is 1001151131212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 397434419776 + 1723877091225 = 630424^2 + 1312965^2 .

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 2121311511001 - 2¹ = 2121311510999 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2121311511001.

It is not an unprimeable number, because it can be changed into a prime (2121311511031) 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, 67641130 + ... + 67672483.

It is an arithmetic number, because the mean of its divisors is an integer number (270559571193).

Almost surely, 2^{2121311511001} is an apocalyptic number.

It is an amenable number.

2121311511001 is a deficient number, since it is larger than the sum of its proper divisors (43165058543).

2121311511001 is a wasteful number, since it uses less digits than its factorization.

2121311511001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135313931.

The product of its (nonzero) digits is 60, while the sum is 19.

Adding to 2121311511001 its reverse (1001151131212), we get a palindrome (3122462642213).

The spelling of 2121311511001 in words is "two trillion, one hundred twenty-one billion, three hundred eleven million, five hundred eleven thousand, one".