1220121200929 has 2 divisors, whose sum is σ = 1220121200930. Its totient is φ = 1220121200928.

The previous prime is 1220121200917. The next prime is 1220121201017. The reversal of 1220121200929 is 9290021210221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 983002846225 + 237118354704 = 991465^2 + 486948^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220121200929 - 2¹⁹ = 1220120676641 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1220121200929.

It is not a weakly prime, because it can be changed into another prime (1220121200329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610060600464 + 610060600465.

It is an arithmetic number, because the mean of its divisors is an integer number (610060600465).

Almost surely, 2^{1220121200929} is an apocalyptic number.

It is an amenable number.

1220121200929 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220121200929 is an equidigital number, since it uses as much as digits as its factorization.

1220121200929 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 31.

The spelling of 1220121200929 in words is "one trillion, two hundred twenty billion, one hundred twenty-one million, two hundred thousand, nine hundred twenty-nine".