105531021 has 6 divisors (see below), whose sum is σ = 152433710. Its totient is φ = 70354008.

The previous prime is 105530981. The next prime is 105531043. The reversal of 105531021 is 120135501.

105531021 is a `hidden beast` number, since 10 + 553 + 102 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 93896100 + 11634921 = 9690^2 + 3411^2 .

It is not a de Polignac number, because 105531021 - 2¹⁰ = 105529997 is a prime.

It is a super-2 number, since 2×105531021² = 22273592786604882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 105530985 and 105531003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105531091) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5862826 + ... + 5862843.

Almost surely, 2^105531021 is an apocalyptic number.

It is an amenable number.

105531021 is a deficient number, since it is larger than the sum of its proper divisors (46902689).

105531021 is a wasteful number, since it uses less digits than its factorization.

105531021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11725675 (or 11725672 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 105531021 is about 10272.8292597512. The cubic root of 105531021 is about 472.5633609496.

Adding to 105531021 its reverse (120135501), we get a palindrome (225666522).

The spelling of 105531021 in words is "one hundred five million, five hundred thirty-one thousand, twenty-one".