221136479 has 2 divisors, whose sum is σ = 221136480. Its totient is φ = 221136478.

The previous prime is 221136469. The next prime is 221136523. The reversal of 221136479 is 974631122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221136479 - 2⁴ = 221136463 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221136469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110568239 + 110568240.

It is an arithmetic number, because the mean of its divisors is an integer number (110568240).

Almost surely, 2^221136479 is an apocalyptic number.

221136479 is a deficient number, since it is larger than the sum of its proper divisors (1).

221136479 is an equidigital number, since it uses as much as digits as its factorization.

221136479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 35.

The square root of 221136479 is about 14870.6583243648. The cubic root of 221136479 is about 604.7187901499.

The spelling of 221136479 in words is "two hundred twenty-one million, one hundred thirty-six thousand, four hundred seventy-nine".