221415064242520 has 32 divisors (see below), whose sum is σ = 498184910604720. Its totient is φ = 88565845064320.

The previous prime is 221415064242467. The next prime is 221415064242529. The reversal of 221415064242520 is 25242460514122.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221415064242529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15159390 + ... + 25935250.

Almost surely, 2^{221415064242520} is an apocalyptic number.

221415064242520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221415064242520 is an abundant number, since it is smaller than the sum of its proper divisors (276769846362200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221415064242520 is a wasteful number, since it uses less digits than its factorization.

221415064242520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11289555 (or 11289551 counting only the distinct ones).

The product of its (nonzero) digits is 307200, while the sum is 40.

The spelling of 221415064242520 in words is "two hundred twenty-one trillion, four hundred fifteen billion, sixty-four million, two hundred forty-two thousand, five hundred twenty".