2021155925 has 24 divisors (see below), whose sum is σ = 2658686976. Its totient is φ = 1518928640.

The previous prime is 2021155909. The next prime is 2021155933. The reversal of 2021155925 is 5295511202.

It is not a de Polignac number, because 2021155925 - 2⁴ = 2021155909 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2021155891 and 2021155900.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 235052 + ... + 243498.

It is an arithmetic number, because the mean of its divisors is an integer number (110778624).

Almost surely, 2^2021155925 is an apocalyptic number.

2021155925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2021155925 is a deficient number, since it is larger than the sum of its proper divisors (637531051).

2021155925 is a wasteful number, since it uses less digits than its factorization.

2021155925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9037 (or 9032 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 32.

The square root of 2021155925 is about 44957.2677661799. The cubic root of 2021155925 is about 1264.3479430967.

The spelling of 2021155925 in words is "two billion, twenty-one million, one hundred fifty-five thousand, nine hundred twenty-five".