221985403 has 2 divisors, whose sum is σ = 221985404. Its totient is φ = 221985402.

The previous prime is 221985383. The next prime is 221985419. The reversal of 221985403 is 304589122.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221985403 is a prime.

It is not a weakly prime, because it can be changed into another prime (221985433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110992701 + 110992702.

It is an arithmetic number, because the mean of its divisors is an integer number (110992702).

Almost surely, 2^221985403 is an apocalyptic number.

221985403 is a deficient number, since it is larger than the sum of its proper divisors (1).

221985403 is an equidigital number, since it uses as much as digits as its factorization.

221985403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 221985403 is about 14899.1745744521. The cubic root of 221985403 is about 605.4916232567.

The spelling of 221985403 in words is "two hundred twenty-one million, nine hundred eighty-five thousand, four hundred three".