121601620215 has 24 divisors (see below), whose sum is σ = 210802192848. Its totient is φ = 64846181760.

The previous prime is 121601620207. The next prime is 121601620219. The reversal of 121601620215 is 512026106121.

121601620215 is a `hidden beast` number, since 1 + 2 + 16 + 0 + 1 + 620 + 21 + 5 = 666.

It is not a de Polignac number, because 121601620215 - 2³ = 121601620207 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121601620219) 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, 210520 + ... + 536210.

It is an arithmetic number, because the mean of its divisors is an integer number (8783424702).

Almost surely, 2^121601620215 is an apocalyptic number.

121601620215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121601620215 is a deficient number, since it is larger than the sum of its proper divisors (89200572633).

121601620215 is a wasteful number, since it uses less digits than its factorization.

121601620215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333999 (or 333996 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

Adding to 121601620215 its reverse (512026106121), we get a palindrome (633627726336).

The spelling of 121601620215 in words is "one hundred twenty-one billion, six hundred one million, six hundred twenty thousand, two hundred fifteen".