106510021 has 4 divisors (see below), whose sum is σ = 106531200. Its totient is φ = 106488844.

The previous prime is 106509979. The next prime is 106510043. The reversal of 106510021 is 120015601.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 106510021 - 2⁹ = 106509509 is a prime.

It is a super-2 number, since 2×106510021² = 22688769146840882, 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 = 106509977 and 106510004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (106510081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1740 + ... + 14698.

It is an arithmetic number, because the mean of its divisors is an integer number (26632800).

Almost surely, 2^106510021 is an apocalyptic number.

It is an amenable number.

106510021 is a deficient number, since it is larger than the sum of its proper divisors (21179).

106510021 is an equidigital number, since it uses as much as digits as its factorization.

106510021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21178.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 106510021 is about 10320.3692278910. The cubic root of 106510021 is about 474.0201718940.

Adding to 106510021 its reverse (120015601), we get a palindrome (226525622).

The spelling of 106510021 in words is "one hundred six million, five hundred ten thousand, twenty-one".