221221222002021 has 16 divisors (see below), whose sum is σ = 296510512979520. Its totient is φ = 146706478955520.

The previous prime is 221221222001977. The next prime is 221221222002073. The reversal of 221221222002021 is 120200222122122.

It is not a de Polignac number, because 221221222002021 - 2¹⁴ = 221221221985637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221221222000021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4912386 + ... + 21600323.

It is an arithmetic number, because the mean of its divisors is an integer number (18531907061220).

Almost surely, 2^{221221222002021} is an apocalyptic number.

It is an amenable number.

221221222002021 is a deficient number, since it is larger than the sum of its proper divisors (75289290977499).

221221222002021 is a wasteful number, since it uses less digits than its factorization.

221221222002021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26527316.

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

Adding to 221221222002021 its reverse (120200222122122), we get a palindrome (341421444124143).

The spelling of 221221222002021 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, two hundred twenty-two million, two thousand, twenty-one".