121713205 has 16 divisors (see below), whose sum is σ = 148760064. Its totient is φ = 95578560.

The previous prime is 121713199. The next prime is 121713209. The reversal of 121713205 is 502317121.

It is a happy number.

It is not a de Polignac number, because 121713205 - 2⁵ = 121713173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121713209) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140604 + ... + 141466.

It is an arithmetic number, because the mean of its divisors is an integer number (9297504).

Almost surely, 2^121713205 is an apocalyptic number.

It is an amenable number.

121713205 is a deficient number, since it is larger than the sum of its proper divisors (27046859).

121713205 is an equidigital number, since it uses as much as digits as its factorization.

121713205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1356.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 121713205 is about 11032.3707787583. The cubic root of 121713205 is about 495.5786247912.

It can be divided in two parts, 12171 and 3205, that added together give a square (15376 = 124²).

The spelling of 121713205 in words is "one hundred twenty-one million, seven hundred thirteen thousand, two hundred five".