20012221022221 has 4 divisors (see below), whose sum is σ = 20438012958912. Its totient is φ = 19586429085532.

The previous prime is 20012221022197. The next prime is 20012221022239. The reversal of 20012221022221 is 12222012221002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20012221022221 - 2³¹ = 20010073538573 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 (20012221022251) 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 3 ways as a sum of consecutive naturals, for example, 212895968275 + ... + 212895968368.

It is an arithmetic number, because the mean of its divisors is an integer number (5109503239728).

Almost surely, 2^{20012221022221} is an apocalyptic number.

It is an amenable number.

20012221022221 is a deficient number, since it is larger than the sum of its proper divisors (425791936691).

20012221022221 is an equidigital number, since it uses as much as digits as its factorization.

20012221022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425791936690.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 20012221022221 its reverse (12222012221002), we get a palindrome (32234233243223).

The spelling of 20012221022221 in words is "twenty trillion, twelve billion, two hundred twenty-one million, twenty-two thousand, two hundred twenty-one".