105621 has 16 divisors (see below), whose sum is σ = 158400. Its totient is φ = 62208.
The previous prime is 105619. The next prime is 105649. The reversal of 105621 is 126501.
It is not a de Polignac number, because 105621 - 21 = 105619 is a prime.
It is a super-2 number, since 2×1056212 = 22311591282, which contains 22 as substring.
It is a self number, because there is not a number n which added to its sum of digits gives 105621.
It is a congruent number.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 105621.
It is not an unprimeable number, because it can be changed into a prime (105601) by changing a digit.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 915 + ... + 1023.
It is an arithmetic number, because the mean of its divisors is an integer number (9900).
2105621 is an apocalyptic number.
It is an amenable number.
105621 is a deficient number, since it is larger than the sum of its proper divisors (52779).
105621 is a wasteful number, since it uses less digits than its factorization.
105621 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 148.
The product of its (nonzero) digits is 60, while the sum is 15.
The square root of 105621 is about 324.9938460956. The cubic root of 105621 is about 47.2697630157.
The spelling of 105621 in words is "one hundred five thousand, six hundred twenty-one".
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