21881530115 has 16 divisors (see below), whose sum is σ = 26776500480. Its totient is φ = 17162204640.

The previous prime is 21881530103. The next prime is 21881530123. The reversal of 21881530115 is 51103518812.

It is not a de Polignac number, because 21881530115 - 2¹⁰ = 21881529091 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108629 + ... + 235718.

It is an arithmetic number, because the mean of its divisors is an integer number (1673531280).

Almost surely, 2^21881530115 is an apocalyptic number.

21881530115 is a deficient number, since it is larger than the sum of its proper divisors (4894970365).

21881530115 is a wasteful number, since it uses less digits than its factorization.

21881530115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344602.

The product of its (nonzero) digits is 9600, while the sum is 35.

The spelling of 21881530115 in words is "twenty-one billion, eight hundred eighty-one million, five hundred thirty thousand, one hundred fifteen".