221220022122021 has 32 divisors (see below), whose sum is σ = 318488586780672. Its totient is φ = 135775710072000.

The previous prime is 221220022121957. The next prime is 221220022122031. The reversal of 221220022122021 is 120221220022122.

It is not a de Polignac number, because 221220022122021 - 2⁶ = 221220022121957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221220022122031) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 516352146 + ... + 516780396.

It is an arithmetic number, because the mean of its divisors is an integer number (9952768336896).

Almost surely, 2^{221220022122021} is an apocalyptic number.

It is an amenable number.

221220022122021 is a deficient number, since it is larger than the sum of its proper divisors (97268564658651).

221220022122021 is a wasteful number, since it uses less digits than its factorization.

221220022122021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463233.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 221220022122021 its reverse (120221220022122), we get a palindrome (341441242144143).

The spelling of 221220022122021 in words is "two hundred twenty-one trillion, two hundred twenty billion, twenty-two million, one hundred twenty-two thousand, twenty-one".