121705643135 has 16 divisors (see below), whose sum is σ = 159034600800. Its totient is φ = 89059372416.

The previous prime is 121705643131. The next prime is 121705643167. The reversal of 121705643135 is 531346507121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 121705643135 - 2² = 121705643131 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121705643131) 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, 22085384 + ... + 22090893.

It is an arithmetic number, because the mean of its divisors is an integer number (9939662550).

Almost surely, 2^121705643135 is an apocalyptic number.

121705643135 is a deficient number, since it is larger than the sum of its proper divisors (37328957665).

121705643135 is a wasteful number, since it uses less digits than its factorization.

121705643135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44176330.

The product of its (nonzero) digits is 75600, while the sum is 38.

The spelling of 121705643135 in words is "one hundred twenty-one billion, seven hundred five million, six hundred forty-three thousand, one hundred thirty-five".