20210011001221 has 4 divisors (see below), whose sum is σ = 20213700984972. Its totient is φ = 20206321017472.

The previous prime is 20210011001153. The next prime is 20210011001251. The reversal of 20210011001221 is 12210011001202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17739377170596 + 2470633830625 = 4211814^2 + 1571825^2 .

It is a cyclic number.

It is not a de Polignac number, because 20210011001221 - 2⁷ = 20210011001093 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 (20210011001251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1844983660 + ... + 1844994613.

It is an arithmetic number, because the mean of its divisors is an integer number (5053425246243).

Almost surely, 2^{20210011001221} is an apocalyptic number.

It is an amenable number.

20210011001221 is a deficient number, since it is larger than the sum of its proper divisors (3689983751).

20210011001221 is an equidigital number, since it uses as much as digits as its factorization.

20210011001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3689983750.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20210011001221 its reverse (12210011001202), we get a palindrome (32420022002423).

The spelling of 20210011001221 in words is "twenty trillion, two hundred ten billion, eleven million, one thousand, two hundred twenty-one".