21026516115 has 32 divisors (see below), whose sum is σ = 36885312000. Its totient is φ = 10143429120.

The previous prime is 21026516081. The next prime is 21026516141. The reversal of 21026516115 is 51161562012.

It is not a de Polignac number, because 21026516115 - 2⁷ = 21026515987 is a prime.

It is a super-2 number, since 2×21026516115² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 287350 + ... + 353019.

It is an arithmetic number, because the mean of its divisors is an integer number (1152666000).

Almost surely, 2^21026516115 is an apocalyptic number.

21026516115 is a deficient number, since it is larger than the sum of its proper divisors (15858795885).

21026516115 is a wasteful number, since it uses less digits than its factorization.

21026516115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640587.

The product of its (nonzero) digits is 3600, while the sum is 30.

The spelling of 21026516115 in words is "twenty-one billion, twenty-six million, five hundred sixteen thousand, one hundred fifteen".