21010130545451 has 4 divisors (see below), whose sum is σ = 21032553311112. Its totient is φ = 20987707779792.

The previous prime is 21010130545447. The next prime is 21010130545553. The reversal of 21010130545451 is 15454503101012.

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 21010130545451 - 2² = 21010130545447 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21010130545351) 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, 11211381425 + ... + 11211383298.

It is an arithmetic number, because the mean of its divisors is an integer number (5258138327778).

Almost surely, 2^{21010130545451} is an apocalyptic number.

21010130545451 is a deficient number, since it is larger than the sum of its proper divisors (22422765661).

21010130545451 is an equidigital number, since it uses as much as digits as its factorization.

21010130545451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22422765660.

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

Adding to 21010130545451 its reverse (15454503101012), we get a palindrome (36464633646463).

The spelling of 21010130545451 in words is "twenty-one trillion, ten billion, one hundred thirty million, five hundred forty-five thousand, four hundred fifty-one".