The square root of 21748745238025 is 4663555.
It is a de Polignac number, because none of the positive numbers 2k-21748745238025 is a prime.
It is a Duffinian number.
It is an unprimeable number.
Almost surely, 221748745238025 is an apocalyptic number.
21748745238025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.
21748745238025 is the 4663555-th square number.
21748745238025 is the 2331778-th centered octagonal number.
It is an amenable number.
21748745238025 is an frugal number, since it uses more digits than its factorization.
21748745238025 is an odious number, because the sum of its binary digits is odd.
The spelling of 21748745238025 in words is "twenty-one trillion, seven hundred forty-eight billion, seven hundred forty-five million, two hundred thirty-eight thousand, twenty-five".