221076979493 has 2 divisors, whose sum is σ = 221076979494. Its totient is φ = 221076979492.

The previous prime is 221076979489. The next prime is 221076979499. The reversal of 221076979493 is 394979670122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 213279559684 + 7797419809 = 461822^2 + 88303^2 .

It is a cyclic number.

It is not a de Polignac number, because 221076979493 - 2² = 221076979489 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221076979499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110538489746 + 110538489747.

It is an arithmetic number, because the mean of its divisors is an integer number (110538489747).

Almost surely, 2^221076979493 is an apocalyptic number.

It is an amenable number.

221076979493 is a deficient number, since it is larger than the sum of its proper divisors (1).

221076979493 is an equidigital number, since it uses as much as digits as its factorization.

221076979493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10287648, while the sum is 59.

The spelling of 221076979493 in words is "two hundred twenty-one billion, seventy-six million, nine hundred seventy-nine thousand, four hundred ninety-three".