6213380721 has 16 divisors (see below), whose sum is σ = 8373596160. Its totient is φ = 4097779200.

The previous prime is 6213380717. The next prime is 6213380729. The reversal of 6213380721 is 1270833126.

It is not a de Polignac number, because 6213380721 - 2² = 6213380717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6213380729) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 379521 + ... + 395553.

It is an arithmetic number, because the mean of its divisors is an integer number (523349760).

Almost surely, 2^6213380721 is an apocalyptic number.

It is an amenable number.

6213380721 is a deficient number, since it is larger than the sum of its proper divisors (2160215439).

6213380721 is a wasteful number, since it uses less digits than its factorization.

6213380721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17416.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 6213380721 is about 78825.0006089439. Note that the first 3 decimals coincide. The cubic root of 6213380721 is about 1838.4111915965.

The spelling of 6213380721 in words is "six billion, two hundred thirteen million, three hundred eighty thousand, seven hundred twenty-one".