20402703572221 has 4 divisors (see below), whose sum is σ = 20402910220000. Its totient is φ = 20402496924444.

The previous prime is 20402703572191. The next prime is 20402703572291. The reversal of 20402703572221 is 12227530720402.

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 20402703572221 - 2¹¹ = 20402703570173 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 (20402703572291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103175721 + ... + 103373278.

It is an arithmetic number, because the mean of its divisors is an integer number (5100727555000).

Almost surely, 2^{20402703572221} is an apocalyptic number.

It is an amenable number.

20402703572221 is a deficient number, since it is larger than the sum of its proper divisors (206647779).

20402703572221 is an equidigital number, since it uses as much as digits as its factorization.

20402703572221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206647778.

The product of its (nonzero) digits is 94080, while the sum is 37.

The spelling of 20402703572221 in words is "twenty trillion, four hundred two billion, seven hundred three million, five hundred seventy-two thousand, two hundred twenty-one".