1212021109997 has 2 divisors, whose sum is σ = 1212021109998. Its totient is φ = 1212021109996.

The previous prime is 1212021109961. The next prime is 1212021110051. The reversal of 1212021109997 is 7999011202121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 752254390276 + 459766719721 = 867326^2 + 678061^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212021109997 - 2²² = 1212016915693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212021109097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606010554998 + 606010554999.

It is an arithmetic number, because the mean of its divisors is an integer number (606010554999).

Almost surely, 2^{1212021109997} is an apocalyptic number.

It is an amenable number.

1212021109997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212021109997 is an equidigital number, since it uses as much as digits as its factorization.

1212021109997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 44.

The spelling of 1212021109997 in words is "one trillion, two hundred twelve billion, twenty-one million, one hundred nine thousand, nine hundred ninety-seven".