21161015459986 has 4 divisors (see below), whose sum is σ = 31741523189982. Its totient is φ = 10580507729992.

The previous prime is 21161015459971. The next prime is 21161015460001. The reversal of 21161015459986 is 68995451016112.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21161015459971) and next prime (21161015460001).

It can be written as a sum of positive squares in only one way, i.e., 18299102285025 + 2861913174961 = 4277745^2 + 1691719^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21161015459986.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5290253864995 + ... + 5290253864998.

Almost surely, 2^{21161015459986} is an apocalyptic number.

21161015459986 is a deficient number, since it is larger than the sum of its proper divisors (10580507729996).

21161015459986 is a wasteful number, since it uses less digits than its factorization.

21161015459986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10580507729995.

The product of its (nonzero) digits is 4665600, while the sum is 58.

The spelling of 21161015459986 in words is "twenty-one trillion, one hundred sixty-one billion, fifteen million, four hundred fifty-nine thousand, nine hundred eighty-six".