21266533051625 has 32 divisors (see below), whose sum is σ = 26585284392576. Its totient is φ = 16984610760000.

The previous prime is 21266533051583. The next prime is 21266533051661. The reversal of 21266533051625 is 52615033566212.

It is not a de Polignac number, because 21266533051625 - 2¹⁶ = 21266532986089 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21266533051625.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1013598635 + ... + 1013619615.

It is an arithmetic number, because the mean of its divisors is an integer number (830790137268).

Almost surely, 2^{21266533051625} is an apocalyptic number.

21266533051625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21266533051625 is a deficient number, since it is larger than the sum of its proper divisors (5318751340951).

21266533051625 is a wasteful number, since it uses less digits than its factorization.

21266533051625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34250 (or 34240 counting only the distinct ones).

The product of its (nonzero) digits is 1944000, while the sum is 47.

The spelling of 21266533051625 in words is "twenty-one trillion, two hundred sixty-six billion, five hundred thirty-three million, fifty-one thousand, six hundred twenty-five".