6722121 has 8 divisors (see below), whose sum is σ = 10243264. Its totient is φ = 3841200.

The previous prime is 6722117. The next prime is 6722129. The reversal of 6722121 is 1212276.

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

It is not a de Polignac number, because 6722121 - 2² = 6722117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 320101 = 6722121 / (6 + 7 + 2 + 2 + 1 + 2 + 1).

It is a Duffinian number.

6722121 is a modest number, since divided by 2121 gives 672 as remainder.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6722129) 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, 160030 + ... + 160071.

It is an arithmetic number, because the mean of its divisors is an integer number (1280408).

Almost surely, 2^6722121 is an apocalyptic number.

It is an amenable number.

6722121 is a deficient number, since it is larger than the sum of its proper divisors (3521143).

6722121 is a wasteful number, since it uses less digits than its factorization.

6722121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320111.

The product of its digits is 336, while the sum is 21.

The square root of 6722121 is about 2592.7053438445. The cubic root of 6722121 is about 188.7276107531.

Adding to 6722121 its reverse (1212276), we get a palindrome (7934397).

The spelling of 6722121 in words is "six million, seven hundred twenty-two thousand, one hundred twenty-one".