121011202721 has 2 divisors, whose sum is σ = 121011202722. Its totient is φ = 121011202720.

The previous prime is 121011202717. The next prime is 121011202729. The reversal of 121011202721 is 127202110121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104821185121 + 16190017600 = 323761^2 + 127240^2 .

It is a cyclic number.

It is not a de Polignac number, because 121011202721 - 2² = 121011202717 is a prime.

It is a super-2 number, since 2×121011202721² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121011202693 and 121011202702.

It is not a weakly prime, because it can be changed into another prime (121011202729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60505601360 + 60505601361.

It is an arithmetic number, because the mean of its divisors is an integer number (60505601361).

Almost surely, 2^121011202721 is an apocalyptic number.

It is an amenable number.

121011202721 is a deficient number, since it is larger than the sum of its proper divisors (1).

121011202721 is an equidigital number, since it uses as much as digits as its factorization.

121011202721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 20.

Adding to 121011202721 its reverse (127202110121), we get a palindrome (248213312842).

The spelling of 121011202721 in words is "one hundred twenty-one billion, eleven million, two hundred two thousand, seven hundred twenty-one".