21260550100451 has 4 divisors (see below), whose sum is σ = 21261081800400. Its totient is φ = 21260018400504.

The previous prime is 21260550100441. The next prime is 21260550100547. The reversal of 21260550100451 is 15400105506212.

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

It is a cyclic number.

It is not a de Polignac number, because 21260550100451 - 2³⁴ = 21243370231267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21260550100411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265789991 + ... + 265869968.

It is an arithmetic number, because the mean of its divisors is an integer number (5315270450100).

Almost surely, 2^{21260550100451} is an apocalyptic number.

21260550100451 is a deficient number, since it is larger than the sum of its proper divisors (531699949).

21260550100451 is an equidigital number, since it uses as much as digits as its factorization.

21260550100451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531699948.

The product of its (nonzero) digits is 12000, while the sum is 32.

Adding to 21260550100451 its reverse (15400105506212), we get a palindrome (36660655606663).

The spelling of 21260550100451 in words is "twenty-one trillion, two hundred sixty billion, five hundred fifty million, one hundred thousand, four hundred fifty-one".