20331223002221 has 8 divisors (see below), whose sum is σ = 21056172895800. Its totient is φ = 19607864657920.

The previous prime is 20331223002173. The next prime is 20331223002281. The reversal of 20331223002221 is 12220032213302.

It can be written as a sum of positive squares in 4 ways, for example, as 4954519515625 + 15376703486596 = 2225875^2 + 3921314^2 .

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 20331223002221 - 2¹⁴ = 20331222985837 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 (20331223002281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 397861316 + ... + 397912413.

It is an arithmetic number, because the mean of its divisors is an integer number (2632021611975).

Almost surely, 2^{20331223002221} is an apocalyptic number.

It is an amenable number.

20331223002221 is a deficient number, since it is larger than the sum of its proper divisors (724949893579).

20331223002221 is an equidigital number, since it uses as much as digits as its factorization.

20331223002221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 795774639.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 20331223002221 its reverse (12220032213302), we get a palindrome (32551255215523).

The spelling of 20331223002221 in words is "twenty trillion, three hundred thirty-one billion, two hundred twenty-three million, two thousand, two hundred twenty-one".