2001764621 has 4 divisors (see below), whose sum is σ = 2001899712. Its totient is φ = 2001629532.

The previous prime is 2001764591. The next prime is 2001764651. The reversal of 2001764621 is 1264671002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (2001764591) and next prime (2001764651).

It is a cyclic number.

It is not a de Polignac number, because 2001764621 - 2²² = 1997570317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001764651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42131 + ... + 76016.

It is an arithmetic number, because the mean of its divisors is an integer number (500474928).

Almost surely, 2^2001764621 is an apocalyptic number.

It is an amenable number.

2001764621 is a deficient number, since it is larger than the sum of its proper divisors (135091).

2001764621 is a wasteful number, since it uses less digits than its factorization.

2001764621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135090.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 2001764621 is about 44741.0842626774. The cubic root of 2001764621 is about 1260.2914881595.

The spelling of 2001764621 in words is "two billion, one million, seven hundred sixty-four thousand, six hundred twenty-one".