121621702605 has 24 divisors (see below), whose sum is σ = 210715001568. Its totient is φ = 59875298496.

The previous prime is 121621702603. The next prime is 121621702613. The reversal of 121621702605 is 506207126121.

It is not a de Polignac number, because 121621702605 - 2¹ = 121621702603 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121621702603) 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, 23985967 + ... + 23991036.

It is an arithmetic number, because the mean of its divisors is an integer number (8779791732).

Almost surely, 2^121621702605 is an apocalyptic number.

121621702605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121621702605 is a deficient number, since it is larger than the sum of its proper divisors (89093298963).

121621702605 is a wasteful number, since it uses less digits than its factorization.

121621702605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47977037 (or 47977024 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 33.

Adding to 121621702605 its reverse (506207126121), we get a palindrome (627828828726).

The spelling of 121621702605 in words is "one hundred twenty-one billion, six hundred twenty-one million, seven hundred two thousand, six hundred five".