121721927 has 2 divisors, whose sum is σ = 121721928. Its totient is φ = 121721926.

The previous prime is 121721917. The next prime is 121721933. The reversal of 121721927 is 729127121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121721927 - 2²⁴ = 104944711 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121721893 and 121721902.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121721917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60860963 + 60860964.

It is an arithmetic number, because the mean of its divisors is an integer number (60860964).

Almost surely, 2^121721927 is an apocalyptic number.

121721927 is a deficient number, since it is larger than the sum of its proper divisors (1).

121721927 is an equidigital number, since it uses as much as digits as its factorization.

121721927 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3528, while the sum is 32.

The square root of 121721927 is about 11032.7660629599. The cubic root of 121721927 is about 495.5904622729.

The spelling of 121721927 in words is "one hundred twenty-one million, seven hundred twenty-one thousand, nine hundred twenty-seven".