15121105200221 has 8 divisors (see below), whose sum is σ = 15146208785664. Its totient is φ = 15096002248800.

The previous prime is 15121105200203. The next prime is 15121105200251. The reversal of 15121105200221 is 12200250112151.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15121105200221 is a prime.

It is a super-3 number, since 3×15121105200221³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15121105200251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89387906 + ... + 89556908.

It is an arithmetic number, because the mean of its divisors is an integer number (1893276098208).

Almost surely, 2^{15121105200221} is an apocalyptic number.

It is an amenable number.

15121105200221 is a deficient number, since it is larger than the sum of its proper divisors (25103585443).

15121105200221 is a wasteful number, since it uses less digits than its factorization.

15121105200221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317011.

The product of its (nonzero) digits is 400, while the sum is 23.

Adding to 15121105200221 its reverse (12200250112151), we get a palindrome (27321355312372).

The spelling of 15121105200221 in words is "fifteen trillion, one hundred twenty-one billion, one hundred five million, two hundred thousand, two hundred twenty-one".