10021222221 has 16 divisors (see below), whose sum is σ = 13405077504. Its totient is φ = 6659126384.

The previous prime is 10021222213. The next prime is 10021222243. The reversal of 10021222221 is 12222212001.

It is a cyclic number.

It is not a de Polignac number, because 10021222221 - 2³ = 10021222213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 10021222221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10021222201) 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, 1334740 + ... + 1342226.

It is an arithmetic number, because the mean of its divisors is an integer number (837817344).

Almost surely, 2^10021222221 is an apocalyptic number.

It is an amenable number.

10021222221 is a deficient number, since it is larger than the sum of its proper divisors (3383855283).

10021222221 is an equidigital number, since it uses as much as digits as its factorization.

10021222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8880.

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

Adding to 10021222221 its reverse (12222212001), we get a palindrome (22243434222).

The spelling of 10021222221 in words is "ten billion, twenty-one million, two hundred twenty-two thousand, two hundred twenty-one".