221222010021 has 16 divisors (see below), whose sum is σ = 319930829568. Its totient is φ = 135420454400.

The previous prime is 221222009909. The next prime is 221222010059. The reversal of 221222010021 is 120010222122.

It is a cyclic number.

It is not a de Polignac number, because 221222010021 - 2¹¹ = 221222007973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221222020021) 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, 52896525 + ... + 52900706.

It is an arithmetic number, because the mean of its divisors is an integer number (19995676848).

Almost surely, 2^221222010021 is an apocalyptic number.

It is an amenable number.

221222010021 is a deficient number, since it is larger than the sum of its proper divisors (98708819547).

221222010021 is a wasteful number, since it uses less digits than its factorization.

221222010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105797292.

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

Adding to 221222010021 its reverse (120010222122), we get a palindrome (341232232143).

The spelling of 221222010021 in words is "two hundred twenty-one billion, two hundred twenty-two million, ten thousand, twenty-one".