2001747421 has 4 divisors (see below), whose sum is σ = 2001840700. Its totient is φ = 2001654144.

The previous prime is 2001747401. The next prime is 2001747443. The reversal of 2001747421 is 1247471002.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1216963225 + 784784196 = 34885^2 + 28014^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001747421 - 2⁹ = 2001746909 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2001747421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001747401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3565 + ... + 63373.

It is an arithmetic number, because the mean of its divisors is an integer number (500460175).

Almost surely, 2^2001747421 is an apocalyptic number.

It is an amenable number.

2001747421 is a deficient number, since it is larger than the sum of its proper divisors (93279).

2001747421 is an equidigital number, since it uses as much as digits as its factorization.

2001747421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93278.

The product of its (nonzero) digits is 3136, while the sum is 28.

The square root of 2001747421 is about 44740.8920451973. The cubic root of 2001747421 is about 1260.2878784984.

The spelling of 2001747421 in words is "two billion, one million, seven hundred forty-seven thousand, four hundred twenty-one".