21731437115 has 16 divisors (see below), whose sum is σ = 26177585376. Its totient is φ = 17318707200.

The previous prime is 21731437103. The next prime is 21731437121. The reversal of 21731437115 is 51173413712.

It is not a de Polignac number, because 21731437115 - 2¹⁰ = 21731436091 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1407035 + ... + 1422395.

It is an arithmetic number, because the mean of its divisors is an integer number (1636099086).

Almost surely, 2^21731437115 is an apocalyptic number.

21731437115 is a deficient number, since it is larger than the sum of its proper divisors (4446148261).

21731437115 is a wasteful number, since it uses less digits than its factorization.

21731437115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16430.

The product of its digits is 17640, while the sum is 35.

The spelling of 21731437115 in words is "twenty-one billion, seven hundred thirty-one million, four hundred thirty-seven thousand, one hundred fifteen".