121221949867 has 2 divisors, whose sum is σ = 121221949868. Its totient is φ = 121221949866.

The previous prime is 121221949789. The next prime is 121221949883. The reversal of 121221949867 is 768949122121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121221949867 - 2¹⁹ = 121221425579 is a prime.

It is a super-2 number, since 2×121221949867² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121221943867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610974933 + 60610974934.

It is an arithmetic number, because the mean of its divisors is an integer number (60610974934).

Almost surely, 2^121221949867 is an apocalyptic number.

121221949867 is a deficient number, since it is larger than the sum of its proper divisors (1).

121221949867 is an equidigital number, since it uses as much as digits as its factorization.

121221949867 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 52.

The spelling of 121221949867 in words is "one hundred twenty-one billion, two hundred twenty-one million, nine hundred forty-nine thousand, eight hundred sixty-seven".