221520072468 has 24 divisors (see below), whose sum is σ = 516892757472. Its totient is φ = 73838225824.

The previous prime is 221520072467. The next prime is 221520072509. The reversal of 221520072468 is 864270025122.

It is a super-2 number, since 2×221520072468² (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 (221520072461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 346546 + ... + 750422.

It is an arithmetic number, because the mean of its divisors is an integer number (21537198228).

Almost surely, 2^221520072468 is an apocalyptic number.

It is an amenable number.

221520072468 is an abundant number, since it is smaller than the sum of its proper divisors (295372685004).

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

221520072468 is a wasteful number, since it uses less digits than its factorization.

221520072468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449591 (or 449589 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 39.

The spelling of 221520072468 in words is "two hundred twenty-one billion, five hundred twenty million, seventy-two thousand, four hundred sixty-eight".