221553836311387 has 32 divisors (see below), whose sum is σ = 228767898240000. Its totient is φ = 214468895367168.

The previous prime is 221553836311361. The next prime is 221553836311459. The reversal of 221553836311387 is 783113638355122.

It is a happy number.

It is not a de Polignac number, because 221553836311387 - 2⁷ = 221553836311259 is a prime.

It is a super-2 number, since 2×221553836311387² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221553836311187) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15301728814 + ... + 15301743292.

It is an arithmetic number, because the mean of its divisors is an integer number (7148996820000).

Almost surely, 2^{221553836311387} is an apocalyptic number.

221553836311387 is a deficient number, since it is larger than the sum of its proper divisors (7214061928613).

221553836311387 is a wasteful number, since it uses less digits than its factorization.

221553836311387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25395.

The product of its digits is 21772800, while the sum is 58.

The spelling of 221553836311387 in words is "two hundred twenty-one trillion, five hundred fifty-three billion, eight hundred thirty-six million, three hundred eleven thousand, three hundred eighty-seven".