21731437130 has 16 divisors (see below), whose sum is σ = 42125555304. Its totient is φ = 8023915200.

The previous prime is 21731437121. The next prime is 21731437151. The reversal of 21731437130 is 3173413712.

It can be written as a sum of positive squares in 4 ways, for example, as 7953607489 + 13777829641 = 89183^2 + 117379^2 .

It is a Curzon number.

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 7 ways as a sum of consecutive naturals, for example, 83582321 + ... + 83582580.

Almost surely, 2^21731437130 is an apocalyptic number.

21731437130 is a deficient number, since it is larger than the sum of its proper divisors (20394118174).

21731437130 is a wasteful number, since it uses less digits than its factorization.

21731437130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167164921.

The product of its (nonzero) digits is 10584, while the sum is 32.

The spelling of 21731437130 in words is "twenty-one billion, seven hundred thirty-one million, four hundred thirty-seven thousand, one hundred thirty".