3764921221 has 4 divisors (see below), whose sum is σ = 3928613472. Its totient is φ = 3601228972.

The previous prime is 3764921207. The next prime is 3764921257. The reversal of 3764921221 is 1221294673.

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 a cyclic number.

It is not a de Polignac number, because 3764921221 - 2⁷ = 3764921093 is a prime.

It is a super-2 number, since 2×3764921221² = 28349263600672261682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3764921261) 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, 81846091 + ... + 81846136.

It is an arithmetic number, because the mean of its divisors is an integer number (982153368).

Almost surely, 2^3764921221 is an apocalyptic number.

It is an amenable number.

3764921221 is a deficient number, since it is larger than the sum of its proper divisors (163692251).

3764921221 is a wasteful number, since it uses less digits than its factorization.

3764921221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163692250.

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

The square root of 3764921221 is about 61358.9538779794. The cubic root of 3764921221 is about 1555.6741349720.

The spelling of 3764921221 in words is "three billion, seven hundred sixty-four million, nine hundred twenty-one thousand, two hundred twenty-one".