20012021003423 has 4 divisors (see below), whose sum is σ = 20039547855600. Its totient is φ = 19984494151248.

The previous prime is 20012021003419. The next prime is 20012021003449. The reversal of 20012021003423 is 32430012021002.

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

It is a cyclic number.

It is not a de Polignac number, because 20012021003423 - 2² = 20012021003419 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20012021003395 and 20012021003404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012021003473) 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, 13763424998 + ... + 13763426451.

It is an arithmetic number, because the mean of its divisors is an integer number (5009886963900).

Almost surely, 2^{20012021003423} is an apocalyptic number.

20012021003423 is a deficient number, since it is larger than the sum of its proper divisors (27526852177).

20012021003423 is an equidigital number, since it uses as much as digits as its factorization.

20012021003423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27526852176.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 20012021003423 its reverse (32430012021002), we get a palindrome (52442033024425).

The spelling of 20012021003423 in words is "twenty trillion, twelve billion, twenty-one million, three thousand, four hundred twenty-three".