6722156021 has 8 divisors (see below), whose sum is σ = 7683226944. Its totient is φ = 5761275840.

The previous prime is 6722156003. The next prime is 6722156071. The reversal of 6722156021 is 1206512276.

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 6722156021 - 2¹⁰ = 6722154997 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 (6722156071) 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, 38141 + ... + 122061.

It is an arithmetic number, because the mean of its divisors is an integer number (960403368).

Almost surely, 2^6722156021 is an apocalyptic number.

It is an amenable number.

6722156021 is a deficient number, since it is larger than the sum of its proper divisors (961070923).

6722156021 is a wasteful number, since it uses less digits than its factorization.

6722156021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95371.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 6722156021 is about 81988.7554546354. The cubic root of 6722156021 is about 1887.2793849777.

Adding to 6722156021 its reverse (1206512276), we get a palindrome (7928668297).

The spelling of 6722156021 in words is "six billion, seven hundred twenty-two million, one hundred fifty-six thousand, twenty-one".