10221000122221 has 12 divisors (see below), whose sum is σ = 11983354802688. Its totient is φ = 8691874114392.

The previous prime is 10221000122189. The next prime is 10221000122231. The reversal of 10221000122221 is 12222100012201.

It is a happy number.

It is not a de Polignac number, because 10221000122221 - 2⁵ = 10221000122189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10221000122195 and 10221000122204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10221000122231) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 821221491 + ... + 821233936.

It is an arithmetic number, because the mean of its divisors is an integer number (998612900224).

Almost surely, 2^{10221000122221} is an apocalyptic number.

It is an amenable number.

10221000122221 is a deficient number, since it is larger than the sum of its proper divisors (1762354680467).

10221000122221 is a wasteful number, since it uses less digits than its factorization.

10221000122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1642455568 (or 1642455561 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 10221000122221 its reverse (12222100012201), we get a palindrome (22443100134422).

The spelling of 10221000122221 in words is "ten trillion, two hundred twenty-one billion, one hundred twenty-two thousand, two hundred twenty-one".