221211997049 has 2 divisors, whose sum is σ = 221211997050. Its totient is φ = 221211997048.

The previous prime is 221211997033. The next prime is 221211997103. The reversal of 221211997049 is 940799112122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 158026125625 + 63185871424 = 397525^2 + 251368^2 .

It is a cyclic number.

It is not a de Polignac number, because 221211997049 - 2⁴ = 221211997033 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221211996994 and 221211997012.

It is not a weakly prime, because it can be changed into another prime (221211997949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110605998524 + 110605998525.

It is an arithmetic number, because the mean of its divisors is an integer number (110605998525).

Almost surely, 2^221211997049 is an apocalyptic number.

It is an amenable number.

221211997049 is a deficient number, since it is larger than the sum of its proper divisors (1).

221211997049 is an equidigital number, since it uses as much as digits as its factorization.

221211997049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 47.

The spelling of 221211997049 in words is "two hundred twenty-one billion, two hundred eleven million, nine hundred ninety-seven thousand, forty-nine".