21101021986 has 8 divisors (see below), whose sum is σ = 34528945104. Its totient is φ = 9591373620.

The previous prime is 21101021971. The next prime is 21101021987. The reversal of 21101021986 is 68912010112.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (21101021987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 479568660 + ... + 479568703.

It is an arithmetic number, because the mean of its divisors is an integer number (4316118138).

Almost surely, 2^21101021986 is an apocalyptic number.

21101021986 is a deficient number, since it is larger than the sum of its proper divisors (13427923118).

21101021986 is a wasteful number, since it uses less digits than its factorization.

21101021986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 959137376.

The product of its (nonzero) digits is 1728, while the sum is 31.

The spelling of 21101021986 in words is "twenty-one billion, one hundred one million, twenty-one thousand, nine hundred eighty-six".