21115351514 has 8 divisors (see below), whose sum is σ = 31683747348. Its totient is φ = 10554102400.

The previous prime is 21115351513. The next prime is 21115351571. The reversal of 21115351514 is 41515351112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15678796225 + 5436555289 = 125215^2 + 73733^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21115351513) 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, 1779287 + ... + 1791114.

Almost surely, 2^21115351514 is an apocalyptic number.

21115351514 is a deficient number, since it is larger than the sum of its proper divisors (10568395834).

21115351514 is a wasteful number, since it uses less digits than its factorization.

21115351514 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3573360.

The product of its digits is 3000, while the sum is 29.

The spelling of 21115351514 in words is "twenty-one billion, one hundred fifteen million, three hundred fifty-one thousand, five hundred fourteen".