106620521 has 16 divisors (see below), whose sum is σ = 127248000. Its totient is φ = 89251344.

The previous prime is 106620509. The next prime is 106620523. The reversal of 106620521 is 125026601.

It is not a de Polignac number, because 106620521 - 2¹⁰ = 106619497 is a prime.

It is a super-2 number, since 2×106620521² = 22735870996622882, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (106620523) 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, 11135 + ... + 18363.

It is an arithmetic number, because the mean of its divisors is an integer number (7953000).

Almost surely, 2^106620521 is an apocalyptic number.

It is an amenable number.

106620521 is a deficient number, since it is larger than the sum of its proper divisors (20627479).

106620521 is an frugal number, since it uses more digits than its factorization.

106620521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7293 (or 7279 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 106620521 is about 10325.7213307352. The cubic root of 106620521 is about 474.1840410622.

The spelling of 106620521 in words is "one hundred six million, six hundred twenty thousand, five hundred twenty-one".