2021216625 has 128 divisors (see below), whose sum is σ = 3922214400. Its totient is φ = 1025740800.

The previous prime is 2021216597. The next prime is 2021216663. The reversal of 2021216625 is 5266121202.

2021216625 is a `hidden beast` number, since 2 + 0 + 21 + 2 + 16 + 625 = 666.

It is not a de Polignac number, because 2021216625 - 2¹⁹ = 2020692337 is a prime.

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 10472529 + ... + 10472721.

It is an arithmetic number, because the mean of its divisors is an integer number (30642300).

Almost surely, 2^2021216625 is an apocalyptic number.

2021216625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2021216625 is a deficient number, since it is larger than the sum of its proper divisors (1900997775).

2021216625 is a wasteful number, since it uses less digits than its factorization.

2021216625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353 (or 337 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 2021216625 is about 44957.9428466206. The cubic root of 2021216625 is about 1264.3606000704.

Adding to 2021216625 its reverse (5266121202), we get a palindrome (7287337827).

The spelling of 2021216625 in words is "two billion, twenty-one million, two hundred sixteen thousand, six hundred twenty-five".