121644785029 has 2 divisors, whose sum is σ = 121644785030. Its totient is φ = 121644785028.

The previous prime is 121644785021. The next prime is 121644785039. The reversal of 121644785029 is 920587446121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71411872900 + 50232912129 = 267230^2 + 224127^2 .

It is a cyclic number.

It is not a de Polignac number, because 121644785029 - 2³ = 121644785021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121644785021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60822392514 + 60822392515.

It is an arithmetic number, because the mean of its divisors is an integer number (60822392515).

Almost surely, 2^121644785029 is an apocalyptic number.

It is an amenable number.

121644785029 is a deficient number, since it is larger than the sum of its proper divisors (1).

121644785029 is an equidigital number, since it uses as much as digits as its factorization.

121644785029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 967680, while the sum is 49.

The spelling of 121644785029 in words is "one hundred twenty-one billion, six hundred forty-four million, seven hundred eighty-five thousand, twenty-nine".