106566421 has 32 divisors (see below), whose sum is σ = 131241600. Its totient is φ = 85432320.

The previous prime is 106566379. The next prime is 106566433. The reversal of 106566421 is 124665601.

It is a cyclic number.

It is not a de Polignac number, because 106566421 - 2¹³ = 106558229 is a prime.

It is a super-3 number, since 3×106566421³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (106566461) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 171850 + ... + 172468.

It is an arithmetic number, because the mean of its divisors is an integer number (4101300).

Almost surely, 2^106566421 is an apocalyptic number.

It is an amenable number.

106566421 is a deficient number, since it is larger than the sum of its proper divisors (24675179).

106566421 is a wasteful number, since it uses less digits than its factorization.

106566421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 709.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 106566421 is about 10323.1013266363. The cubic root of 106566421 is about 474.1038260576.

The spelling of 106566421 in words is "one hundred six million, five hundred sixty-six thousand, four hundred twenty-one".