118100821 has 2 divisors, whose sum is σ = 118100822. Its totient is φ = 118100820.

The previous prime is 118100809. The next prime is 118100861. The reversal of 118100821 is 128001811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79834225 + 38266596 = 8935^2 + 6186^2 .

It is a cyclic number.

It is not a de Polignac number, because 118100821 - 2¹³ = 118092629 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 118100792 and 118100801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (118100861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59050410 + 59050411.

It is an arithmetic number, because the mean of its divisors is an integer number (59050411).

Almost surely, 2^118100821 is an apocalyptic number.

It is an amenable number.

118100821 is a deficient number, since it is larger than the sum of its proper divisors (1).

118100821 is an equidigital number, since it uses as much as digits as its factorization.

118100821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 22.

The square root of 118100821 is about 10867.4201630378. The cubic root of 118100821 is about 490.6264665243.

The spelling of 118100821 in words is "one hundred eighteen million, one hundred thousand, eight hundred twenty-one".