2121385925 has 24 divisors (see below), whose sum is σ = 2677328640. Its totient is φ = 1667086400.

The previous prime is 2121385907. The next prime is 2121385943. The reversal of 2121385925 is 5295831212.

It is an interprime number because it is at equal distance from previous prime (2121385907) and next prime (2121385943).

It is not a de Polignac number, because 2121385925 - 2²² = 2117191621 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 518036 + ... + 522114.

It is an arithmetic number, because the mean of its divisors is an integer number (111555360).

Almost surely, 2^2121385925 is an apocalyptic number.

2121385925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2121385925 is a deficient number, since it is larger than the sum of its proper divisors (555942715).

2121385925 is a wasteful number, since it uses less digits than its factorization.

2121385925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4453 (or 4448 counting only the distinct ones).

The product of its digits is 43200, while the sum is 38.

The square root of 2121385925 is about 46058.5054577328. The cubic root of 2121385925 is about 1284.9115343317.

The spelling of 2121385925 in words is "two billion, one hundred twenty-one million, three hundred eighty-five thousand, nine hundred twenty-five".