221406151 has 2 divisors, whose sum is σ = 221406152. Its totient is φ = 221406150.

The previous prime is 221406121. The next prime is 221406161. The reversal of 221406151 is 151604122.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221406151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221406121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110703075 + 110703076.

It is an arithmetic number, because the mean of its divisors is an integer number (110703076).

Almost surely, 2^221406151 is an apocalyptic number.

221406151 is a deficient number, since it is larger than the sum of its proper divisors (1).

221406151 is an equidigital number, since it uses as much as digits as its factorization.

221406151 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 221406151 is about 14879.7228132785. The cubic root of 221406151 is about 604.9645048957.

The spelling of 221406151 in words is "two hundred twenty-one million, four hundred six thousand, one hundred fifty-one".