21110221020986 has 4 divisors (see below), whose sum is σ = 31665331531482. Its totient is φ = 10555110510492.

The previous prime is 21110221020929. The next prime is 21110221020991. The reversal of 21110221020986 is 68902012201112.

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

It can be written as a sum of positive squares in only one way, i.e., 17139889801225 + 3970331219761 = 4140035^2 + 1992569^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5277555255245 + ... + 5277555255248.

Almost surely, 2^{21110221020986} is an apocalyptic number.

21110221020986 is a deficient number, since it is larger than the sum of its proper divisors (10555110510496).

21110221020986 is a wasteful number, since it uses less digits than its factorization.

21110221020986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10555110510495.

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

The spelling of 21110221020986 in words is "twenty-one trillion, one hundred ten billion, two hundred twenty-one million, twenty thousand, nine hundred eighty-six".