221210412 has 24 divisors (see below), whose sum is σ = 538599936. Its totient is φ = 70530768.

The previous prime is 221210387. The next prime is 221210413. The reversal of 221210412 is 214012122.

It is a junction number, because it is equal to n+sod(n) for n = 221210391 and 221210400.

It is not an unprimeable number, because it can be changed into a prime (221210413) 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, 400468 + ... + 401019.

It is an arithmetic number, because the mean of its divisors is an integer number (22441664).

Almost surely, 2^221210412 is an apocalyptic number.

It is an amenable number.

221210412 is an abundant number, since it is smaller than the sum of its proper divisors (317389524).

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

221210412 is a wasteful number, since it uses less digits than its factorization.

221210412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 801517 (or 801515 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 221210412 is about 14873.1439850490. The cubic root of 221210412 is about 604.7861749205.

Adding to 221210412 its reverse (214012122), we get a palindrome (435222534).

The spelling of 221210412 in words is "two hundred twenty-one million, two hundred ten thousand, four hundred twelve".