21712157067130 has 16 divisors (see below), whose sum is σ = 39082116063240. Its totient is φ = 8684810972992.

The previous prime is 21712157067121. The next prime is 21712157067163. The reversal of 21712157067130 is 3176075121712.

It can be written as a sum of positive squares in 4 ways, for example, as 18824465206089 + 2887691861041 = 4338717^2 + 1699321^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4699789 + ... + 8093968.

Almost surely, 2^{21712157067130} is an apocalyptic number.

21712157067130 is a deficient number, since it is larger than the sum of its proper divisors (17369958996110).

21712157067130 is a wasteful number, since it uses less digits than its factorization.

21712157067130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12963473.

The product of its (nonzero) digits is 123480, while the sum is 43.

The spelling of 21712157067130 in words is "twenty-one trillion, seven hundred twelve billion, one hundred fifty-seven million, sixty-seven thousand, one hundred thirty".