221222022021 has 64 divisors (see below), whose sum is σ = 440037642240. Its totient is φ = 106080477120.

The previous prime is 221222022019. The next prime is 221222022037. The reversal of 221222022021 is 120220222122.

221222022021 is a `hidden beast` number, since 221 + 2 + 220 + 220 + 2 + 1 = 666.

It is not a de Polignac number, because 221222022021 - 2¹ = 221222022019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221222021985 and 221222022003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221222022011) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4065585 + ... + 4119638.

It is an arithmetic number, because the mean of its divisors is an integer number (6875588160).

Almost surely, 2^221222022021 is an apocalyptic number.

221222022021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

221222022021 is a deficient number, since it is larger than the sum of its proper divisors (218815620219).

221222022021 is a wasteful number, since it uses less digits than its factorization.

221222022021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8185263 (or 8185257 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 221222022021 its reverse (120220222122), we get a palindrome (341442244143).

The spelling of 221222022021 in words is "two hundred twenty-one billion, two hundred twenty-two million, twenty-two thousand, twenty-one".