121665303210 has 32 divisors (see below), whose sum is σ = 318541885632. Its totient is φ = 29494618880.

The previous prime is 121665303161. The next prime is 121665303229. The reversal of 121665303210 is 12303566121.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 184341039 + ... + 184341698.

It is an arithmetic number, because the mean of its divisors is an integer number (9954433926).

Almost surely, 2^121665303210 is an apocalyptic number.

121665303210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121665303210 is an abundant number, since it is smaller than the sum of its proper divisors (196876582422).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121665303210 is a wasteful number, since it uses less digits than its factorization.

121665303210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368682758.

The product of its (nonzero) digits is 6480, while the sum is 30.

Adding to 121665303210 its reverse (12303566121), we get a palindrome (133968869331).

The spelling of 121665303210 in words is "one hundred twenty-one billion, six hundred sixty-five million, three hundred three thousand, two hundred ten".