21310016155 has 8 divisors (see below), whose sum is σ = 25611917184. Its totient is φ = 17021414400.

The previous prime is 21310016141. The next prime is 21310016177. The reversal of 21310016155 is 55161001312.

It is a happy number.

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

It is not a de Polignac number, because 21310016155 - 2⁷ = 21310016027 is a prime.

It is a Duffinian 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, 3321291 + ... + 3327700.

It is an arithmetic number, because the mean of its divisors is an integer number (3201489648).

Almost surely, 2^21310016155 is an apocalyptic number.

21310016155 is a deficient number, since it is larger than the sum of its proper divisors (4301901029).

21310016155 is an equidigital number, since it uses as much as digits as its factorization.

21310016155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6649637.

The product of its (nonzero) digits is 900, while the sum is 25.

Adding to 21310016155 its reverse (55161001312), we get a palindrome (76471017467).

The spelling of 21310016155 in words is "twenty-one billion, three hundred ten million, sixteen thousand, one hundred fifty-five".