2221021021986 has 48 divisors (see below), whose sum is σ = 5235809060664. Its totient is φ = 676345807872.

The previous prime is 2221021021981. The next prime is 2221021022009. The reversal of 2221021021986 is 6891201201222.

2221021021986 is a `hidden beast` number, since 2 + 221 + 0 + 210 + 219 + 8 + 6 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1326447441225 + 894573580761 = 1151715^2 + 945819^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2221021021986.

It is not an unprimeable number, because it can be changed into a prime (2221021021981) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48902781 + ... + 48948176.

Almost surely, 2^{2221021021986} is an apocalyptic number.

2221021021986 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

2221021021986 is an abundant number, since it is smaller than the sum of its proper divisors (3014788038678).

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

2221021021986 is a wasteful number, since it uses less digits than its factorization.

2221021021986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97851075 (or 97851072 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The spelling of 2221021021986 in words is "two trillion, two hundred twenty-one billion, twenty-one million, twenty-one thousand, nine hundred eighty-six".