101021986 has 8 divisors (see below), whose sum is σ = 163189404. Its totient is φ = 46625520.

The previous prime is 101021981. The next prime is 101022059. The reversal of 101021986 is 689120101.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 97713225 + 3308761 = 9885^2 + 1819^2 .

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 (101021981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1942705 + ... + 1942756.

Almost surely, 2^101021986 is an apocalyptic number.

101021986 is a deficient number, since it is larger than the sum of its proper divisors (62167418).

101021986 is a wasteful number, since it uses less digits than its factorization.

101021986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3885476.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 101021986 is about 10050.9694059827. The cubic root of 101021986 is about 465.7347400815.

The spelling of 101021986 in words is "one hundred one million, twenty-one thousand, nine hundred eighty-six".