221157011 has 2 divisors, whose sum is σ = 221157012. Its totient is φ = 221157010.

The previous prime is 221156989. The next prime is 221157031. The reversal of 221157011 is 110751122.

It is a happy number.

It is an a-pointer prime, because the next prime (221157031) can be obtained adding 221157011 to its sum of digits (20).

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221157011 is a prime.

It is not a weakly prime, because it can be changed into another prime (221157031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110578505 + 110578506.

It is an arithmetic number, because the mean of its divisors is an integer number (110578506).

Almost surely, 2^221157011 is an apocalyptic number.

221157011 is a deficient number, since it is larger than the sum of its proper divisors (1).

221157011 is an equidigital number, since it uses as much as digits as its factorization.

221157011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 140, while the sum is 20.

The square root of 221157011 is about 14871.3486611000. The cubic root of 221157011 is about 604.7375051414.

The spelling of 221157011 in words is "two hundred twenty-one million, one hundred fifty-seven thousand, eleven".