221021221010 has 32 divisors (see below), whose sum is σ = 404869881600. Its totient is φ = 86848030720.

The previous prime is 221021221009. The next prime is 221021221013. The reversal of 221021221010 is 10122120122.

It is not an unprimeable number, because it can be changed into a prime (221021221013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 698375 + ... + 964245.

It is an arithmetic number, because the mean of its divisors is an integer number (12652183800).

Almost surely, 2^221021221010 is an apocalyptic number.

221021221010 is a deficient number, since it is larger than the sum of its proper divisors (183848660590).

221021221010 is a wasteful number, since it uses less digits than its factorization.

221021221010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267346.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 221021221010 its reverse (10122120122), we get a palindrome (231143341132).

The spelling of 221021221010 in words is "two hundred twenty-one billion, twenty-one million, two hundred twenty-one thousand, ten".