21612514232371 has 4 divisors (see below), whose sum is σ = 21612770022744. Its totient is φ = 21612258442000.

The previous prime is 21612514232333. The next prime is 21612514232401. The reversal of 21612514232371 is 17323241521612.

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 21612514232371 - 2²¹ = 21612512135219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21612514832371) 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, 127768405 + ... + 127937446.

It is an arithmetic number, because the mean of its divisors is an integer number (5403192505686).

Almost surely, 2^{21612514232371} is an apocalyptic number.

21612514232371 is a deficient number, since it is larger than the sum of its proper divisors (255790373).

21612514232371 is an equidigital number, since it uses as much as digits as its factorization.

21612514232371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255790372.

The product of its digits is 120960, while the sum is 40.

Adding to 21612514232371 its reverse (17323241521612), we get a palindrome (38935755753983).

The spelling of 21612514232371 in words is "twenty-one trillion, six hundred twelve billion, five hundred fourteen million, two hundred thirty-two thousand, three hundred seventy-one".