4221353666 has 4 divisors (see below), whose sum is σ = 6332030502. Its totient is φ = 2110676832.

The previous prime is 4221353663. The next prime is 4221353723. The reversal of 4221353666 is 6663531224.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 4217853025 + 3500641 = 64945^2 + 1871^2 .

It is not an unprimeable number, because it can be changed into a prime (4221353663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1055338415 + ... + 1055338418.

Almost surely, 2^4221353666 is an apocalyptic number.

4221353666 is a deficient number, since it is larger than the sum of its proper divisors (2110676836).

4221353666 is a wasteful number, since it uses less digits than its factorization.

4221353666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2110676835.

The product of its digits is 155520, while the sum is 38.

The square root of 4221353666 is about 64971.9452225343. The cubic root of 4221353666 is about 1616.1583597323.

The spelling of 4221353666 in words is "four billion, two hundred twenty-one million, three hundred fifty-three thousand, six hundred sixty-six".