121820087 has 2 divisors, whose sum is σ = 121820088. Its totient is φ = 121820086.

The previous prime is 121820081. The next prime is 121820093. The reversal of 121820087 is 780028121.

It is a balanced prime because it is at equal distance from previous prime (121820081) and next prime (121820093).

It is a cyclic number.

It is not a de Polignac number, because 121820087 - 2²⁴ = 105042871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121820081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60910043 + 60910044.

It is an arithmetic number, because the mean of its divisors is an integer number (60910044).

Almost surely, 2^121820087 is an apocalyptic number.

121820087 is a deficient number, since it is larger than the sum of its proper divisors (1).

121820087 is an equidigital number, since it uses as much as digits as its factorization.

121820087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1792, while the sum is 29.

The square root of 121820087 is about 11037.2137335471. The cubic root of 121820087 is about 495.7236458606.

The spelling of 121820087 in words is "one hundred twenty-one million, eight hundred twenty thousand, eighty-seven".