4191426721 has 4 divisors (see below), whose sum is σ = 4437981252. Its totient is φ = 3944872192.

The previous prime is 4191426713. The next prime is 4191426739. The reversal of 4191426721 is 1276241914.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3119781025 + 1071645696 = 55855^2 + 32736^2 .

It is a cyclic number.

It is not a de Polignac number, because 4191426721 - 2³ = 4191426713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4191426121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123277240 + ... + 123277273.

It is an arithmetic number, because the mean of its divisors is an integer number (1109495313).

Almost surely, 2^4191426721 is an apocalyptic number.

It is an amenable number.

4191426721 is a deficient number, since it is larger than the sum of its proper divisors (246554531).

4191426721 is a wasteful number, since it uses less digits than its factorization.

4191426721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246554530.

The product of its digits is 24192, while the sum is 37.

The square root of 4191426721 is about 64741.2289117221. The cubic root of 4191426721 is about 1612.3300907526.

It can be divided in two parts, 41914 and 26721, that added together give a triangular number (68635 = T₃₇₀).

The spelling of 4191426721 in words is "four billion, one hundred ninety-one million, four hundred twenty-six thousand, seven hundred twenty-one".