221121010997 has 2 divisors, whose sum is σ = 221121010998. Its totient is φ = 221121010996.

The previous prime is 221121010987. The next prime is 221121011003. The reversal of 221121010997 is 799010121122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 209842783396 + 11278227601 = 458086^2 + 106199^2 .

It is a cyclic number.

It is not a de Polignac number, because 221121010997 - 2¹⁴ = 221120994613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221121010987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110560505498 + 110560505499.

It is an arithmetic number, because the mean of its divisors is an integer number (110560505499).

Almost surely, 2^221121010997 is an apocalyptic number.

It is an amenable number.

221121010997 is a deficient number, since it is larger than the sum of its proper divisors (1).

221121010997 is an equidigital number, since it uses as much as digits as its factorization.

221121010997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 35.

The spelling of 221121010997 in words is "two hundred twenty-one billion, one hundred twenty-one million, ten thousand, nine hundred ninety-seven".