121394205 has 24 divisors (see below), whose sum is σ = 212287608. Its totient is φ = 64167936.

The previous prime is 121394201. The next prime is 121394213. The reversal of 121394205 is 502493121.

It can be written as a sum of positive squares in 4 ways, for example, as 5659641 + 115734564 = 2379^2 + 10758^2 .

It is not a de Polignac number, because 121394205 - 2² = 121394201 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121394201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6852 + ... + 17021.

It is an arithmetic number, because the mean of its divisors is an integer number (8845317).

Almost surely, 2^121394205 is an apocalyptic number.

121394205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121394205 is a deficient number, since it is larger than the sum of its proper divisors (90893403).

121394205 is a wasteful number, since it uses less digits than its factorization.

121394205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23997 (or 23994 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 121394205 is about 11017.9038387526. The cubic root of 121394205 is about 495.1452894603.

The spelling of 121394205 in words is "one hundred twenty-one million, three hundred ninety-four thousand, two hundred five".