21376001202517 has 4 divisors (see below), whose sum is σ = 23020308987340. Its totient is φ = 19731693417696.

The previous prime is 21376001202407. The next prime is 21376001202533. The reversal of 21376001202517 is 71520210067312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5608224412561 + 15767776789956 = 2368169^2 + 3970866^2 .

It is not a de Polignac number, because 21376001202517 - 2⁷ = 21376001202389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21376001202557) 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, 822153892392 + ... + 822153892417.

It is an arithmetic number, because the mean of its divisors is an integer number (5755077246835).

Almost surely, 2^{21376001202517} is an apocalyptic number.

It is an amenable number.

21376001202517 is a deficient number, since it is larger than the sum of its proper divisors (1644307784823).

21376001202517 is a wasteful number, since it uses less digits than its factorization.

21376001202517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1644307784822.

The product of its (nonzero) digits is 35280, while the sum is 37.

Adding to 21376001202517 its reverse (71520210067312), we get a palindrome (92896211269829).

The spelling of 21376001202517 in words is "twenty-one trillion, three hundred seventy-six billion, one million, two hundred two thousand, five hundred seventeen".