222121757749 has 2 divisors, whose sum is σ = 222121757750. Its totient is φ = 222121757748.

The previous prime is 222121757617. The next prime is 222121757777. The reversal of 222121757749 is 947757121222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123961734724 + 98160023025 = 352082^2 + 313305^2 .

It is a cyclic number.

It is not a de Polignac number, because 222121757749 - 2¹³ = 222121749557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222121757779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111060878874 + 111060878875.

It is an arithmetic number, because the mean of its divisors is an integer number (111060878875).

Almost surely, 2^222121757749 is an apocalyptic number.

It is an amenable number.

222121757749 is a deficient number, since it is larger than the sum of its proper divisors (1).

222121757749 is an equidigital number, since it uses as much as digits as its factorization.

222121757749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 987840, while the sum is 49.

The spelling of 222121757749 in words is "two hundred twenty-two billion, one hundred twenty-one million, seven hundred fifty-seven thousand, seven hundred forty-nine".