4219236721 has 8 divisors (see below), whose sum is σ = 4869728064. Its totient is φ = 3580681200.

The previous prime is 4219236673. The next prime is 4219236727. The reversal of 4219236721 is 1276329124.

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 4219236721 - 2⁹ = 4219236209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4219236727) 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, 2983195 + ... + 2984608.

It is an arithmetic number, because the mean of its divisors is an integer number (608716008).

Almost surely, 2^4219236721 is an apocalyptic number.

It is an amenable number.

4219236721 is a deficient number, since it is larger than the sum of its proper divisors (650491343).

4219236721 is a wasteful number, since it uses less digits than its factorization.

4219236721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5967911.

The product of its digits is 36288, while the sum is 37.

The square root of 4219236721 is about 64955.6519557767. The cubic root of 4219236721 is about 1615.8881549036. Note that the first 3 decimals are identical.

The spelling of 4219236721 in words is "four billion, two hundred nineteen million, two hundred thirty-six thousand, seven hundred twenty-one".