21161013143425 has 24 divisors (see below), whose sum is σ = 27783582408792. Its totient is φ = 15932759040000.

The previous prime is 21161013143419. The next prime is 21161013143429. The reversal of 21161013143425 is 52434131016112.

It can be written as a sum of positive squares in 12 ways, for example, as 2510396242929 + 18650616900496 = 1584423^2 + 4318636^2 .

It is not a de Polignac number, because 21161013143425 - 2⁵ = 21161013143393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21161013143429) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31096825 + ... + 31770025.

It is an arithmetic number, because the mean of its divisors is an integer number (1157649267033).

Almost surely, 2^{21161013143425} is an apocalyptic number.

21161013143425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21161013143425 is a deficient number, since it is larger than the sum of its proper divisors (6622569265367).

21161013143425 is a wasteful number, since it uses less digits than its factorization.

21161013143425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 747189 (or 747184 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

Adding to 21161013143425 its reverse (52434131016112), we get a palindrome (73595144159537).

The spelling of 21161013143425 in words is "twenty-one trillion, one hundred sixty-one billion, thirteen million, one hundred forty-three thousand, four hundred twenty-five".