3966533421 has 8 divisors (see below), whose sum is σ = 5459314944. Its totient is φ = 2559053760.

The previous prime is 3966533407. The next prime is 3966533429. The reversal of 3966533421 is 1243356693.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3966533421 - 2⁷ = 3966533293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3966533429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21325356 + ... + 21325541.

It is an arithmetic number, because the mean of its divisors is an integer number (682414368).

Almost surely, 2^3966533421 is an apocalyptic number.

3966533421 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

3966533421 is a deficient number, since it is larger than the sum of its proper divisors (1492781523).

3966533421 is a wasteful number, since it uses less digits than its factorization.

3966533421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42650931.

The product of its digits is 349920, while the sum is 42.

The square root of 3966533421 is about 62980.4209338109. The cubic root of 3966533421 is about 1582.9615741144.

The spelling of 3966533421 in words is "three billion, nine hundred sixty-six million, five hundred thirty-three thousand, four hundred twenty-one".