64219221 has 24 divisors (see below), whose sum is σ = 106523040. Its totient is φ = 36871200.

The previous prime is 64219219. The next prime is 64219223. The reversal of 64219221 is 12291246.

64219221 is a `hidden beast` number, since 642 + 19 + 2 + 2 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (64219219) and next prime (64219223).

It is not a de Polignac number, because 64219221 - 2¹ = 64219219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64219223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15190 + ... + 18951.

It is an arithmetic number, because the mean of its divisors is an integer number (4438460).

Almost surely, 2^64219221 is an apocalyptic number.

It is an amenable number.

64219221 is a deficient number, since it is larger than the sum of its proper divisors (42303819).

64219221 is a wasteful number, since it uses less digits than its factorization.

64219221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34177 (or 34174 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 64219221 is about 8013.6895996788. The cubic root of 64219221 is about 400.4561899457.

The spelling of 64219221 in words is "sixty-four million, two hundred nineteen thousand, two hundred twenty-one".