21130045441251 has 16 divisors (see below), whose sum is σ = 28935289495968. Its totient is φ = 13705761081600.

The previous prime is 21130045441243. The next prime is 21130045441259. The reversal of 21130045441251 is 15214454003112.

It is an interprime number because it is at equal distance from previous prime (21130045441243) and next prime (21130045441259).

It is not a de Polignac number, because 21130045441251 - 2³ = 21130045441243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21130045441259) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5801511 + ... + 8713071.

It is an arithmetic number, because the mean of its divisors is an integer number (1808455593498).

Almost surely, 2^{21130045441251} is an apocalyptic number.

21130045441251 is a deficient number, since it is larger than the sum of its proper divisors (7805244054717).

21130045441251 is a wasteful number, since it uses less digits than its factorization.

21130045441251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2976982.

The product of its (nonzero) digits is 19200, while the sum is 33.

Adding to 21130045441251 its reverse (15214454003112), we get a palindrome (36344499444363).

The spelling of 21130045441251 in words is "twenty-one trillion, one hundred thirty billion, forty-five million, four hundred forty-one thousand, two hundred fifty-one".