21225324339025 has 27 divisors (see below), whose sum is σ = 26378806125009. Its totient is φ = 16942020582720.

The previous prime is 21225324338987. The next prime is 21225324339049. The reversal of 21225324339025 is 52093342352212.

The square root of 21225324339025 is 4607095.

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

It can be written as a sum of positive squares in 4 ways, for example, as 989469867841 + 20235854471184 = 994721^2 + 4498428^2 .

It is not a de Polignac number, because 21225324339025 - 2¹¹ = 21225324336977 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 14811809709 + ... + 14811811141.

Almost surely, 2^{21225324339025} is an apocalyptic number.

21225324339025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21225324339025 is the 4607095-th square number.

21225324339025 is the 2303548-th centered octagonal number.

It is an amenable number.

21225324339025 is a deficient number, since it is larger than the sum of its proper divisors (5153481785984).

21225324339025 is an frugal number, since it uses more digits than its factorization.

21225324339025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4162 (or 2081 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 43.

The spelling of 21225324339025 in words is "twenty-one trillion, two hundred twenty-five billion, three hundred twenty-four million, three hundred thirty-nine thousand, twenty-five".