2021238225 has 48 divisors (see below), whose sum is σ = 3776097600. Its totient is φ = 1059701760.

The previous prime is 2021238217. The next prime is 2021238227. The reversal of 2021238225 is 5228321202.

2021238225 is a `hidden beast` number, since 202 + 1 + 238 + 225 = 666.

It is not a de Polignac number, because 2021238225 - 2³ = 2021238217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021238227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14449 + ... + 65201.

It is an arithmetic number, because the mean of its divisors is an integer number (78668700).

It is the magic constant of a 1593 × 1593 magic square.

Almost surely, 2^2021238225 is an apocalyptic number.

2021238225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2021238225 is a deficient number, since it is larger than the sum of its proper divisors (1754859375).

2021238225 is a wasteful number, since it uses less digits than its factorization.

2021238225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50831 (or 50820 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 2021238225 is about 44958.1830704934. The cubic root of 2021238225 is about 1264.3651039735.

Adding to 2021238225 its reverse (5228321202), we get a palindrome (7249559427).

The spelling of 2021238225 in words is "two billion, twenty-one million, two hundred thirty-eight thousand, two hundred twenty-five".