381000221 has 16 divisors (see below), whose sum is σ = 457284864. Its totient is φ = 310362624.

The previous prime is 381000203. The next prime is 381000227. The reversal of 381000221 is 122000183.

It is not a de Polignac number, because 381000221 - 2¹⁰ = 380999197 is a prime.

It is a super-2 number, since 2×381000221² = 290322336804097682, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 381000221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381000227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17741 + ... + 32813.

It is an arithmetic number, because the mean of its divisors is an integer number (28580304).

Almost surely, 2^381000221 is an apocalyptic number.

It is an amenable number.

381000221 is a deficient number, since it is larger than the sum of its proper divisors (76284643).

381000221 is a wasteful number, since it uses less digits than its factorization.

381000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15260.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 381000221 is about 19519.2269570288. The cubic root of 381000221 is about 724.9505925902.

The spelling of 381000221 in words is "three hundred eighty-one million, two hundred twenty-one", and thus it is an aban number.