21011164415 has 8 divisors (see below), whose sum is σ = 25217730000. Its totient is φ = 16806043072.

The previous prime is 21011164379. The next prime is 21011164439. The reversal of 21011164415 is 51446111012.

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 21011164415 - 2¹⁴ = 21011148031 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 328790 + ... + 387459.

It is an arithmetic number, because the mean of its divisors is an integer number (3152216250).

Almost surely, 2^21011164415 is an apocalyptic number.

21011164415 is a deficient number, since it is larger than the sum of its proper divisors (4206565585).

21011164415 is an equidigital number, since it uses as much as digits as its factorization.

21011164415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722121.

The product of its (nonzero) digits is 960, while the sum is 26.

Adding to 21011164415 its reverse (51446111012), we get a palindrome (72457275427).

The spelling of 21011164415 in words is "twenty-one billion, eleven million, one hundred sixty-four thousand, four hundred fifteen".