221221202149 has 2 divisors, whose sum is σ = 221221202150. Its totient is φ = 221221202148.

The previous prime is 221221202143. The next prime is 221221202227. The reversal of 221221202149 is 941202122122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 220660365025 + 560837124 = 469745^2 + 23682^2 .

It is a cyclic number.

It is not a de Polignac number, because 221221202149 - 2¹⁵ = 221221169381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221221202143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110610601074 + 110610601075.

It is an arithmetic number, because the mean of its divisors is an integer number (110610601075).

Almost surely, 2^221221202149 is an apocalyptic number.

It is an amenable number.

221221202149 is a deficient number, since it is larger than the sum of its proper divisors (1).

221221202149 is an equidigital number, since it uses as much as digits as its factorization.

221221202149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 28.

The spelling of 221221202149 in words is "two hundred twenty-one billion, two hundred twenty-one million, two hundred two thousand, one hundred forty-nine".