121829788891 has 2 divisors, whose sum is σ = 121829788892. Its totient is φ = 121829788890.

The previous prime is 121829788853. The next prime is 121829788931. The reversal of 121829788891 is 198887928121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121829788891 - 2⁷ = 121829788763 is a prime.

It is a super-2 number, since 2×121829788891² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121829758891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60914894445 + 60914894446.

It is an arithmetic number, because the mean of its divisors is an integer number (60914894446).

Almost surely, 2^121829788891 is an apocalyptic number.

121829788891 is a deficient number, since it is larger than the sum of its proper divisors (1).

121829788891 is an equidigital number, since it uses as much as digits as its factorization.

121829788891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9289728, while the sum is 64.

The spelling of 121829788891 in words is "one hundred twenty-one billion, eight hundred twenty-nine million, seven hundred eighty-eight thousand, eight hundred ninety-one".