2100021231025 has 27 divisors (see below), whose sum is σ = 2669465887203. Its totient is φ = 1638809097600.

The previous prime is 2100021231017. The next prime is 2100021231029. The reversal of 2100021231025 is 5201321200012.

The square root of 2100021231025 is 1449145.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 13 ways, for example, as 2088814044529 + 11207186496 = 1445273^2 + 105864^2 .

It is not a de Polignac number, because 2100021231025 - 2³ = 2100021231017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2100021230993 and 2100021231011.

It is not an unprimeable number, because it can be changed into a prime (2100021231029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 297071191 + ... + 297078259.

Almost surely, 2^{2100021231025} is an apocalyptic number.

2100021231025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2100021231025 is the 1449145-th square number.

2100021231025 is the 724573-rd centered octagonal number.

It is an amenable number.

2100021231025 is a deficient number, since it is larger than the sum of its proper divisors (569444656178).

2100021231025 is an frugal number, since it uses more digits than its factorization.

2100021231025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14230 (or 7115 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

Adding to 2100021231025 its reverse (5201321200012), we get a palindrome (7301342431037).

The spelling of 2100021231025 in words is "two trillion, one hundred billion, twenty-one million, two hundred thirty-one thousand, twenty-five".