2021210625 has 40 divisors (see below), whose sum is σ = 3848718016. Its totient is φ = 923976000.

The previous prime is 2021210623. The next prime is 2021210627. The reversal of 2021210625 is 5260121202.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2021210623) and next prime (2021210627).

It is not a de Polignac number, because 2021210625 - 2¹ = 2021210623 is a prime.

It is a super-2 number, since 2×2021210625² = 8170584781225781250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2021210623) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 63874 + ... + 90123.

Almost surely, 2^2021210625 is an apocalyptic number.

2021210625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2021210625 is a deficient number, since it is larger than the sum of its proper divisors (1827507391).

2021210625 is an equidigital number, since it uses as much as digits as its factorization.

2021210625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154027 (or 154012 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 2021210625 is about 44957.8761175392. The cubic root of 2021210625 is about 1264.3593489805.

Adding to 2021210625 its reverse (5260121202), we get a palindrome (7281331827).

The spelling of 2021210625 in words is "two billion, twenty-one million, two hundred ten thousand, six hundred twenty-five".