3721012721 has 8 divisors (see below), whose sum is σ = 3773043624. Its totient is φ = 3669010560.

The previous prime is 3721012699. The next prime is 3721012723. The reversal of 3721012721 is 1272101273.

It can be written as a sum of positive squares in 4 ways, for example, as 1395844321 + 2325168400 = 37361^2 + 48220^2 .

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 3721012721 - 2¹⁴ = 3720996337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3721012723) 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, 491255 + ... + 498771.

It is an arithmetic number, because the mean of its divisors is an integer number (471630453).

Almost surely, 2^3721012721 is an apocalyptic number.

It is an amenable number.

3721012721 is a deficient number, since it is larger than the sum of its proper divisors (52030903).

3721012721 is an equidigital number, since it uses as much as digits as its factorization.

3721012721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14371.

The product of its (nonzero) digits is 1176, while the sum is 26.

The square root of 3721012721 is about 61000.1042704027. The cubic root of 3721012721 is about 1549.6027731312.

Adding to 3721012721 its reverse (1272101273), we get a palindrome (4993113994).

It can be divided in two parts, 372101272 and 1, that added together give a palindrome (372101273).

The spelling of 3721012721 in words is "three billion, seven hundred twenty-one million, twelve thousand, seven hundred twenty-one".