21310322151 has 4 divisors (see below), whose sum is σ = 28413762872. Its totient is φ = 14206881432.

The previous prime is 21310322149. The next prime is 21310322197. The reversal of 21310322151 is 15122301312.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21310322151 - 2¹ = 21310322149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21310322351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3551720356 + ... + 3551720361.

It is an arithmetic number, because the mean of its divisors is an integer number (7103440718).

Almost surely, 2^21310322151 is an apocalyptic number.

21310322151 is a deficient number, since it is larger than the sum of its proper divisors (7103440721).

21310322151 is an equidigital number, since it uses as much as digits as its factorization.

21310322151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7103440720.

The product of its (nonzero) digits is 360, while the sum is 21.

Adding to 21310322151 its reverse (15122301312), we get a palindrome (36432623463).

The spelling of 21310322151 in words is "twenty-one billion, three hundred ten million, three hundred twenty-two thousand, one hundred fifty-one".