6651342421 has 8 divisors (see below), whose sum is σ = 6666082304. Its totient is φ = 6636619440.

The previous prime is 6651342359. The next prime is 6651342433. The reversal of 6651342421 is 1242431566.

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

It is a cyclic number.

It is not a de Polignac number, because 6651342421 - 2⁹ = 6651341909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6651042421) 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, 1057516 + ... + 1063786.

It is an arithmetic number, because the mean of its divisors is an integer number (833260288).

Almost surely, 2^6651342421 is an apocalyptic number.

It is an amenable number.

6651342421 is a deficient number, since it is larger than the sum of its proper divisors (14739883).

6651342421 is a wasteful number, since it uses less digits than its factorization.

6651342421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8451.

The product of its digits is 34560, while the sum is 34.

The square root of 6651342421 is about 81555.7626474059. The cubic root of 6651342421 is about 1880.6288846909.

Adding to 6651342421 its reverse (1242431566), we get a palindrome (7893773987).

The spelling of 6651342421 in words is "six billion, six hundred fifty-one million, three hundred forty-two thousand, four hundred twenty-one".