221496823949 has 2 divisors, whose sum is σ = 221496823950. Its totient is φ = 221496823948.

The previous prime is 221496823937. The next prime is 221496823973. The reversal of 221496823949 is 949328694122.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 219626261449 + 1870562500 = 468643^2 + 43250^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221496823949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221496823549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110748411974 + 110748411975.

It is an arithmetic number, because the mean of its divisors is an integer number (110748411975).

Almost surely, 2^221496823949 is an apocalyptic number.

It is an amenable number.

221496823949 is a deficient number, since it is larger than the sum of its proper divisors (1).

221496823949 is an equidigital number, since it uses as much as digits as its factorization.

221496823949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13436928, while the sum is 59.

The spelling of 221496823949 in words is "two hundred twenty-one billion, four hundred ninety-six million, eight hundred twenty-three thousand, nine hundred forty-nine".