21315141521141 has 16 divisors (see below), whose sum is σ = 23028061586544. Its totient is φ = 19612696756224.

The previous prime is 21315141521081. The next prime is 21315141521207. The reversal of 21315141521141 is 14112514151312.

It can be written as a sum of positive squares in 8 ways, for example, as 775473972100 + 20539667549041 = 880610^2 + 4532071^2 .

It is a de Polignac number, because none of the positive numbers 2^k-21315141521141 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21315141521098 and 21315141521107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21315141521341) 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 15 ways as a sum of consecutive naturals, for example, 127572731 + ... + 127739703.

It is an arithmetic number, because the mean of its divisors is an integer number (1439253849159).

Almost surely, 2^{21315141521141} is an apocalyptic number.

It is an amenable number.

21315141521141 is a deficient number, since it is larger than the sum of its proper divisors (1712920065403).

21315141521141 is a wasteful number, since it uses less digits than its factorization.

21315141521141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198280.

The product of its digits is 4800, while the sum is 32.

Adding to 21315141521141 its reverse (14112514151312), we get a palindrome (35427655672453).

The spelling of 21315141521141 in words is "twenty-one trillion, three hundred fifteen billion, one hundred forty-one million, five hundred twenty-one thousand, one hundred forty-one".