221172541503 has 16 divisors (see below), whose sum is σ = 308952953856. Its totient is φ = 140562227520.

The previous prime is 221172541487. The next prime is 221172541507. The reversal of 221172541503 is 305145271122.

It is a happy number.

It is not a de Polignac number, because 221172541503 - 2⁴ = 221172541487 is a prime.

It is a super-2 number, since 2×221172541503² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221172541507) 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 15 ways as a sum of consecutive naturals, for example, 17741526 + ... + 17753987.

It is an arithmetic number, because the mean of its divisors is an integer number (19309559616).

Almost surely, 2^221172541503 is an apocalyptic number.

221172541503 is a deficient number, since it is larger than the sum of its proper divisors (87780412353).

221172541503 is a wasteful number, since it uses less digits than its factorization.

221172541503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35495614.

The product of its (nonzero) digits is 16800, while the sum is 33.

The spelling of 221172541503 in words is "two hundred twenty-one billion, one hundred seventy-two million, five hundred forty-one thousand, five hundred three".