221525033412 has 24 divisors (see below), whose sum is σ = 517690668096. Its totient is φ = 73727545888.

The previous prime is 221525033399. The next prime is 221525033419. The reversal of 221525033412 is 214330525122.

It is a self number, because there is not a number n which added to its sum of digits gives 221525033412.

It is not an unprimeable number, because it can be changed into a prime (221525033419) 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, 14258403 + ... + 14273930.

It is an arithmetic number, because the mean of its divisors is an integer number (21570444504).

Almost surely, 2^221525033412 is an apocalyptic number.

It is an amenable number.

221525033412 is an abundant number, since it is smaller than the sum of its proper divisors (296165634684).

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

221525033412 is a wasteful number, since it uses less digits than its factorization.

221525033412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28532987 (or 28532985 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 221525033412 its reverse (214330525122), we get a palindrome (435855558534).

The spelling of 221525033412 in words is "two hundred twenty-one billion, five hundred twenty-five million, thirty-three thousand, four hundred twelve".