15621221151155 has 8 divisors (see below), whose sum is σ = 18745579118112. Its totient is φ = 12496901096448.

The previous prime is 15621221151121. The next prime is 15621221151157. The reversal of 15621221151155 is 55115112212651.

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

It is a cyclic number.

It is not a de Polignac number, because 15621221151155 - 2²⁸ = 15620952715699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15621221151157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8563559 + ... + 10226288.

It is an arithmetic number, because the mean of its divisors is an integer number (2343197389764).

Almost surely, 2^{15621221151155} is an apocalyptic number.

15621221151155 is a deficient number, since it is larger than the sum of its proper divisors (3124357966957).

15621221151155 is a wasteful number, since it uses less digits than its factorization.

15621221151155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18956125.

The product of its digits is 30000, while the sum is 38.

The spelling of 15621221151155 in words is "fifteen trillion, six hundred twenty-one billion, two hundred twenty-one million, one hundred fifty-one thousand, one hundred fifty-five".