21526036210121 has 4 divisors (see below), whose sum is σ = 21526405364244. Its totient is φ = 21525667056000.

The previous prime is 21526036210117. The next prime is 21526036210127. The reversal of 21526036210121 is 12101263062512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2160711844096 + 19365324366025 = 1469936^2 + 4400605^2 .

It is a cyclic number.

It is not a de Polignac number, because 21526036210121 - 2² = 21526036210117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21526036210127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 184489580 + ... + 184606221.

It is an arithmetic number, because the mean of its divisors is an integer number (5381601341061).

Almost surely, 2^{21526036210121} is an apocalyptic number.

It is an amenable number.

21526036210121 is a deficient number, since it is larger than the sum of its proper divisors (369154123).

21526036210121 is an equidigital number, since it uses as much as digits as its factorization.

21526036210121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369154122.

The product of its (nonzero) digits is 8640, while the sum is 32.

Adding to 21526036210121 its reverse (12101263062512), we get a palindrome (33627299272633).

The spelling of 21526036210121 in words is "twenty-one trillion, five hundred twenty-six billion, thirty-six million, two hundred ten thousand, one hundred twenty-one".