21115665022523 has 8 divisors (see below), whose sum is σ = 22106969614800. Its totient is φ = 20141905644448.

The previous prime is 21115665022519. The next prime is 21115665022537. The reversal of 21115665022523 is 32522056651112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21115665022523 - 2² = 21115665022519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21115665042523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4386301088 + ... + 4386305901.

It is an arithmetic number, because the mean of its divisors is an integer number (2763371201850).

Almost surely, 2^{21115665022523} is an apocalyptic number.

21115665022523 is a deficient number, since it is larger than the sum of its proper divisors (991304592277).

21115665022523 is an equidigital number, since it uses as much as digits as its factorization.

21115665022523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8772607101.

The product of its (nonzero) digits is 216000, while the sum is 41.

The spelling of 21115665022523 in words is "twenty-one trillion, one hundred fifteen billion, six hundred sixty-five million, twenty-two thousand, five hundred twenty-three".