221514215412 has 144 divisors (see below), whose sum is σ = 637427474432. Its totient is φ = 58584841920.

The previous prime is 221514215401. The next prime is 221514215413. The reversal of 221514215412 is 214512415122.

It is a self number, because there is not a number n which added to its sum of digits gives 221514215412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221514215413) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1297113 + ... + 1457919.

Almost surely, 2^221514215412 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221514215412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (318713737216).

221514215412 is an abundant number, since it is smaller than the sum of its proper divisors (415913259020).

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

221514215412 is a wasteful number, since it uses less digits than its factorization.

221514215412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160898 (or 160873 counting only the distinct ones).

The product of its digits is 6400, while the sum is 30.

The spelling of 221514215412 in words is "two hundred twenty-one billion, five hundred fourteen million, two hundred fifteen thousand, four hundred twelve".