20823363841421 has 4 divisors (see below), whose sum is σ = 20823407826144. Its totient is φ = 20823319856700.

The previous prime is 20823363841381. The next prime is 20823363841439. The reversal of 20823363841421 is 12414836332802.

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 20823363841421 - 2¹⁴ = 20823363825037 is a prime.

It is a super-2 number, since 2×20823363841421² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20823363840421) 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, 21274415 + ... + 22231676.

It is an arithmetic number, because the mean of its divisors is an integer number (5205851956536).

Almost surely, 2^{20823363841421} is an apocalyptic number.

It is an amenable number.

20823363841421 is a deficient number, since it is larger than the sum of its proper divisors (43984723).

20823363841421 is an equidigital number, since it uses as much as digits as its factorization.

20823363841421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43984722.

The product of its (nonzero) digits is 1327104, while the sum is 47.

The spelling of 20823363841421 in words is "twenty trillion, eight hundred twenty-three billion, three hundred sixty-three million, eight hundred forty-one thousand, four hundred twenty-one".