3813051221 has 4 divisors (see below), whose sum is σ = 4357772832. Its totient is φ = 3268329612.

The previous prime is 3813051199. The next prime is 3813051247. The reversal of 3813051221 is 1221503183.

3813051221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 3813051221 - 2¹⁸ = 3812789077 is a prime.

It is a super-2 number, since 2×3813051221² = 29078719227939181682, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3813051421) 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, 272360795 + ... + 272360808.

It is an arithmetic number, because the mean of its divisors is an integer number (1089443208).

Almost surely, 2^3813051221 is an apocalyptic number.

It is an amenable number.

3813051221 is a deficient number, since it is larger than the sum of its proper divisors (544721611).

3813051221 is an equidigital number, since it uses as much as digits as its factorization.

3813051221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544721610.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 3813051221 is about 61749.9086719972. The cubic root of 3813051221 is about 1562.2752277076.

The spelling of 3813051221 in words is "three billion, eight hundred thirteen million, fifty-one thousand, two hundred twenty-one".