121469873821 has 2 divisors, whose sum is σ = 121469873822. Its totient is φ = 121469873820.

The previous prime is 121469873779. The next prime is 121469873851. The reversal of 121469873821 is 128378964121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101789712025 + 19680161796 = 319045^2 + 140286^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121469873821 is a prime.

It is a super-2 number, since 2×121469873821² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121469873851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60734936910 + 60734936911.

It is an arithmetic number, because the mean of its divisors is an integer number (60734936911).

Almost surely, 2^121469873821 is an apocalyptic number.

It is an amenable number.

121469873821 is a deficient number, since it is larger than the sum of its proper divisors (1).

121469873821 is an equidigital number, since it uses as much as digits as its factorization.

121469873821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1161216, while the sum is 52.

The spelling of 121469873821 in words is "one hundred twenty-one billion, four hundred sixty-nine million, eight hundred seventy-three thousand, eight hundred twenty-one".