2221724397025 has 81 divisors (see below), whose sum is σ = 3296543244057. Its totient is φ = 1481005512000.

The previous prime is 2221724396963. The next prime is 2221724397071. The reversal of 2221724397025 is 5207934271222.

The square root of 2221724397025 is 1490545.

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 210909644001 + 2010814753024 = 459249^2 + 1418032^2 .

It is not a de Polignac number, because 2221724397025 - 2¹⁵ = 2221724364257 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 1930255200 + ... + 1930256350.

Almost surely, 2^{2221724397025} is an apocalyptic number.

2221724397025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2221724397025 is the 1490545-th square number.

2221724397025 is the 745273-rd centered octagonal number.

It is an amenable number.

2221724397025 is a deficient number, since it is larger than the sum of its proper divisors (1074818847032).

2221724397025 is an frugal number, since it uses more digits than its factorization.

2221724397025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2400 (or 1200 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 46.

The spelling of 2221724397025 in words is "two trillion, two hundred twenty-one billion, seven hundred twenty-four million, three hundred ninety-seven thousand, twenty-five".