21315020414 has 32 divisors (see below), whose sum is σ = 33744522240. Its totient is φ = 10077880032.

The previous prime is 21315020371. The next prime is 21315020417. The reversal of 21315020414 is 41402051312.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a self number, because there is not a number n which added to its sum of digits gives 21315020414.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21315020417) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2336987 + ... + 2346089.

It is an arithmetic number, because the mean of its divisors is an integer number (1054516320).

Almost surely, 2^21315020414 is an apocalyptic number.

21315020414 is a deficient number, since it is larger than the sum of its proper divisors (12429501826).

21315020414 is a wasteful number, since it uses less digits than its factorization.

21315020414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9704.

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 21315020414 its reverse (41402051312), we get a palindrome (62717071726).

The spelling of 21315020414 in words is "twenty-one billion, three hundred fifteen million, twenty thousand, four hundred fourteen".