121231451009 has 2 divisors, whose sum is σ = 121231451010. Its totient is φ = 121231451008.

The previous prime is 121231450919. The next prime is 121231451041. The reversal of 121231451009 is 900154132121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 93940411009 + 27291040000 = 306497^2 + 165200^2 .

It is a cyclic number.

It is not a de Polignac number, because 121231451009 - 2¹² = 121231446913 is a prime.

It is not a weakly prime, because it can be changed into another prime (121231451069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60615725504 + 60615725505.

It is an arithmetic number, because the mean of its divisors is an integer number (60615725505).

Almost surely, 2^121231451009 is an apocalyptic number.

It is an amenable number.

121231451009 is a deficient number, since it is larger than the sum of its proper divisors (1).

121231451009 is an equidigital number, since it uses as much as digits as its factorization.

121231451009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 29.

The spelling of 121231451009 in words is "one hundred twenty-one billion, two hundred thirty-one million, four hundred fifty-one thousand, nine".