121665303263 has 32 divisors (see below), whose sum is σ = 142828697088. Its totient is φ = 101497968000.

The previous prime is 121665303233. The next prime is 121665303271. The reversal of 121665303263 is 362303566121.

It is a cyclic number.

It is not a de Polignac number, because 121665303263 - 2¹⁴ = 121665286879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121665303233) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9903881 + ... + 9916157.

It is an arithmetic number, because the mean of its divisors is an integer number (4463396784).

Almost surely, 2^121665303263 is an apocalyptic number.

121665303263 is a deficient number, since it is larger than the sum of its proper divisors (21163393825).

121665303263 is a wasteful number, since it uses less digits than its factorization.

121665303263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12623.

The product of its (nonzero) digits is 116640, while the sum is 38.

Adding to 121665303263 its reverse (362303566121), we get a palindrome (483968869384).

The spelling of 121665303263 in words is "one hundred twenty-one billion, six hundred sixty-five million, three hundred three thousand, two hundred sixty-three".