21126916986 has 32 divisors (see below), whose sum is σ = 48301807488. Its totient is φ = 6034798080.

The previous prime is 21126916949. The next prime is 21126917003. The reversal of 21126916986 is 68961962112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120606 + ... + 238326.

It is an arithmetic number, because the mean of its divisors is an integer number (1509431484).

Almost surely, 2^21126916986 is an apocalyptic number.

21126916986 is an abundant number, since it is smaller than the sum of its proper divisors (27174890502).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21126916986 is a wasteful number, since it uses less digits than its factorization.

21126916986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122006.

The product of its digits is 559872, while the sum is 51.

The spelling of 21126916986 in words is "twenty-one billion, one hundred twenty-six million, nine hundred sixteen thousand, nine hundred eighty-six".