21515414310155 has 8 divisors (see below), whose sum is σ = 25818980018832. Its totient is φ = 17212009550368.

The previous prime is 21515414310151. The next prime is 21515414310157. The reversal of 21515414310155 is 55101341451512.

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 21515414310155 - 2² = 21515414310151 is a prime.

It is a super-2 number, since 2×21515414310155² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21515414310151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39942932 + ... + 40478001.

It is an arithmetic number, because the mean of its divisors is an integer number (3227372502354).

Almost surely, 2^{21515414310155} is an apocalyptic number.

21515414310155 is a deficient number, since it is larger than the sum of its proper divisors (4303565708677).

21515414310155 is an equidigital number, since it uses as much as digits as its factorization.

21515414310155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80474445.

The product of its (nonzero) digits is 60000, while the sum is 38.

Adding to 21515414310155 its reverse (55101341451512), we get a palindrome (76616755761667).

The spelling of 21515414310155 in words is "twenty-one trillion, five hundred fifteen billion, four hundred fourteen million, three hundred ten thousand, one hundred fifty-five".