21221002011986 has 12 divisors (see below), whose sum is σ = 37028483102718. Its totient is φ = 9094715147952.

The previous prime is 21221002011959. The next prime is 21221002012009. The reversal of 21221002011986 is 68911020012212.

It can be written as a sum of positive squares in only one way, i.e., 14241709844761 + 6979292167225 = 3773819^2 + 2641835^2 .

It is a super-3 number, since 3×21221002011986³ (a number of 41 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 108270418331 + ... + 108270418526.

Almost surely, 2^{21221002011986} is an apocalyptic number.

21221002011986 is a deficient number, since it is larger than the sum of its proper divisors (15807481090732).

21221002011986 is a wasteful number, since it uses less digits than its factorization.

21221002011986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216540836873 (or 216540836866 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 35.

The spelling of 21221002011986 in words is "twenty-one trillion, two hundred twenty-one billion, two million, eleven thousand, nine hundred eighty-six".