2100221025 has 48 divisors (see below), whose sum is σ = 3986125824. Its totient is φ = 955817280.

The previous prime is 2100221017. The next prime is 2100221029. The reversal of 2100221025 is 5201220012.

It is not a de Polignac number, because 2100221025 - 2³ = 2100221017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a junction number, because it is equal to n+sod(n) for n = 2100220995 and 2100221013.

It is not an unprimeable number, because it can be changed into a prime (2100221029) 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, 110364 + ... + 127986.

It is an arithmetic number, because the mean of its divisors is an integer number (83044288).

Almost surely, 2^2100221025 is an apocalyptic number.

2100221025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2100221025 is a deficient number, since it is larger than the sum of its proper divisors (1885904799).

2100221025 is a wasteful number, since it uses less digits than its factorization.

2100221025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17870 (or 17865 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 2100221025 is about 45828.1684665665. The cubic root of 2100221025 is about 1280.6240903971.

Adding to 2100221025 its reverse (5201220012), we get a palindrome (7301441037).

The spelling of 2100221025 in words is "two billion, one hundred million, two hundred twenty-one thousand, twenty-five".