211221101986 has 8 divisors (see below), whose sum is σ = 316833621804. Its totient is φ = 105609894720.

The previous prime is 211221101977. The next prime is 211221101999. The reversal of 211221101986 is 689101122112.

It can be written as a sum of positive squares in 2 ways, for example, as 210617662761 + 603439225 = 458931^2 + 24565^2 .

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

It is a super-2 number, since 2×211221101986² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 378646 + ... + 752206.

Almost surely, 2^211221101986 is an apocalyptic number.

211221101986 is a deficient number, since it is larger than the sum of its proper divisors (105612519818).

211221101986 is a wasteful number, since it uses less digits than its factorization.

211221101986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656276.

The product of its (nonzero) digits is 3456, while the sum is 34.

The spelling of 211221101986 in words is "two hundred eleven billion, two hundred twenty-one million, one hundred one thousand, nine hundred eighty-six".