2121100407 has 6 divisors (see below), whose sum is σ = 3063811712. Its totient is φ = 1414066932.

The previous prime is 2121100393. The next prime is 2121100451. The reversal of 2121100407 is 7040011212.

It is not a de Polignac number, because 2121100407 - 2¹⁵ = 2121067639 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 2121100407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121100477) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 117838903 + ... + 117838920.

Almost surely, 2^2121100407 is an apocalyptic number.

2121100407 is a deficient number, since it is larger than the sum of its proper divisors (942711305).

2121100407 is a wasteful number, since it uses less digits than its factorization.

2121100407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235677829 (or 235677826 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 2121100407 is about 46055.4058390543. The cubic root of 2121100407 is about 1284.8538861960.

Adding to 2121100407 its reverse (7040011212), we get a palindrome (9161111619).

The spelling of 2121100407 in words is "two billion, one hundred twenty-one million, one hundred thousand, four hundred seven".