21500231670411 has 16 divisors (see below), whose sum is σ = 31107792629760. Its totient is φ = 13129912467360.

The previous prime is 21500231670397. The next prime is 21500231670503. The reversal of 21500231670411 is 11407613200512.

It is not a de Polignac number, because 21500231670411 - 2¹³ = 21500231662219 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21500231672411) 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, 2104147531 + ... + 2104157748.

It is an arithmetic number, because the mean of its divisors is an integer number (1944237039360).

Almost surely, 2^{21500231670411} is an apocalyptic number.

21500231670411 is a deficient number, since it is larger than the sum of its proper divisors (9607560959349).

21500231670411 is a wasteful number, since it uses less digits than its factorization.

21500231670411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4208305426.

The product of its (nonzero) digits is 10080, while the sum is 33.

Adding to 21500231670411 its reverse (11407613200512), we get a palindrome (32907844870923).

The spelling of 21500231670411 in words is "twenty-one trillion, five hundred billion, two hundred thirty-one million, six hundred seventy thousand, four hundred eleven".