2121006511 has 4 divisors (see below), whose sum is σ = 2284160872. Its totient is φ = 1957852152.

The previous prime is 2121006509. The next prime is 2121006521. The reversal of 2121006511 is 1156001212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2121006511 - 2¹ = 2121006509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121006521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81577161 + ... + 81577186.

It is an arithmetic number, because the mean of its divisors is an integer number (571040218).

Almost surely, 2^2121006511 is an apocalyptic number.

2121006511 is a deficient number, since it is larger than the sum of its proper divisors (163154361).

2121006511 is a wasteful number, since it uses less digits than its factorization.

2121006511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163154360.

The product of its (nonzero) digits is 120, while the sum is 19.

The square root of 2121006511 is about 46054.3864468956. The cubic root of 2121006511 is about 1284.8349267885.

Adding to 2121006511 its reverse (1156001212), we get a palindrome (3277007723).

The spelling of 2121006511 in words is "two billion, one hundred twenty-one million, six thousand, five hundred eleven".