121663223415 has 24 divisors (see below), whose sum is σ = 210960351888. Its totient is φ = 64863227520.

The previous prime is 121663223371. The next prime is 121663223419. The reversal of 121663223415 is 514322366121.

121663223415 is a `hidden beast` number, since 1 + 2 + 1 + 6 + 632 + 2 + 3 + 4 + 15 = 666.

It is not a de Polignac number, because 121663223415 - 2⁹ = 121663222903 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121663223415.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121663223419) 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, 372094 + ... + 617883.

It is an arithmetic number, because the mean of its divisors is an integer number (8790014662).

Almost surely, 2^121663223415 is an apocalyptic number.

121663223415 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121663223415 is a deficient number, since it is larger than the sum of its proper divisors (89297128473).

121663223415 is a wasteful number, since it uses less digits than its factorization.

121663223415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 992719 (or 992716 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

Adding to 121663223415 its reverse (514322366121), we get a palindrome (635985589536).

The spelling of 121663223415 in words is "one hundred twenty-one billion, six hundred sixty-three million, two hundred twenty-three thousand, four hundred fifteen".