21532510201225 has 6 divisors (see below), whose sum is σ = 26700312649550. Its totient is φ = 17226008160960.

The previous prime is 21532510201207. The next prime is 21532510201393. The reversal of 21532510201225 is 52210201523512.

It can be written as a sum of positive squares in 3 ways, for example, as 4941657864256 + 16590852336969 = 2222984^2 + 4073187^2 .

It is not a de Polignac number, because 21532510201225 - 2¹⁵ = 21532510168457 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 430650204000 + ... + 430650204049.

Almost surely, 2^{21532510201225} is an apocalyptic number.

21532510201225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21532510201225 is a deficient number, since it is larger than the sum of its proper divisors (5167802448325).

21532510201225 is an equidigital number, since it uses as much as digits as its factorization.

21532510201225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861300408059 (or 861300408054 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 31.

Adding to 21532510201225 its reverse (52210201523512), we get a palindrome (73742711724737).

The spelling of 21532510201225 in words is "twenty-one trillion, five hundred thirty-two billion, five hundred ten million, two hundred one thousand, two hundred twenty-five".