21500157712106 has 8 divisors (see below), whose sum is σ = 32612598777060. Its totient is φ = 10629291453088.

The previous prime is 21500157712067. The next prime is 21500157712123. The reversal of 21500157712106 is 60121775100512.

It can be written as a sum of positive squares in 2 ways, for example, as 20402304305881 + 1097853406225 = 4516891^2 + 1047785^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21500157712106² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21500157712106.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60393701261 + ... + 60393701616.

Almost surely, 2^{21500157712106} is an apocalyptic number.

21500157712106 is a deficient number, since it is larger than the sum of its proper divisors (11112441064954).

21500157712106 is a wasteful number, since it uses less digits than its factorization.

21500157712106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120787402968.

The product of its (nonzero) digits is 29400, while the sum is 38.

The spelling of 21500157712106 in words is "twenty-one trillion, five hundred billion, one hundred fifty-seven million, seven hundred twelve thousand, one hundred six".