20021112221221 has 8 divisors (see below), whose sum is σ = 20295399020544. Its totient is φ = 19748647926000.

The previous prime is 20021112221179. The next prime is 20021112221249. The reversal of 20021112221221 is 12212221112002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20021112221221 - 2¹⁷ = 20021112090149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021112221281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 455603905 + ... + 455647846.

It is an arithmetic number, because the mean of its divisors is an integer number (2536924877568).

Almost surely, 2^{20021112221221} is an apocalyptic number.

It is an amenable number.

20021112221221 is a deficient number, since it is larger than the sum of its proper divisors (274286799323).

20021112221221 is a wasteful number, since it uses less digits than its factorization.

20021112221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 911252051.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 20021112221221 its reverse (12212221112002), we get a palindrome (32233333333223).

The spelling of 20021112221221 in words is "twenty trillion, twenty-one billion, one hundred twelve million, two hundred twenty-one thousand, two hundred twenty-one".