21115407310 has 8 divisors (see below), whose sum is σ = 38007733176. Its totient is φ = 8446162920.

The previous prime is 21115407233. The next prime is 21115407317. The reversal of 21115407310 is 1370451112.

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

It is a super-2 number, since 2×21115407310² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21115407317) 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 3 ways as a sum of consecutive naturals, for example, 1055770356 + ... + 1055770375.

It is an arithmetic number, because the mean of its divisors is an integer number (4750966647).

Almost surely, 2^21115407310 is an apocalyptic number.

21115407310 is a deficient number, since it is larger than the sum of its proper divisors (16892325866).

21115407310 is a wasteful number, since it uses less digits than its factorization.

21115407310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2111540738.

The product of its (nonzero) digits is 840, while the sum is 25.

Adding to 21115407310 its reverse (1370451112), we get a palindrome (22485858422).

The spelling of 21115407310 in words is "twenty-one billion, one hundred fifteen million, four hundred seven thousand, three hundred ten".