20201121423021 has 16 divisors (see below), whose sum is σ = 33581084963328. Its totient is φ = 10494089050800.

The previous prime is 20201121423011. The next prime is 20201121423083. The reversal of 20201121423021 is 12032412110202.

It is a happy number.

It is not a de Polignac number, because 20201121423021 - 2⁶ = 20201121422957 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20201121423011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43725370815 + ... + 43725371276.

It is an arithmetic number, because the mean of its divisors is an integer number (2098817810208).

Almost surely, 2^{20201121423021} is an apocalyptic number.

20201121423021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20201121423021 is a deficient number, since it is larger than the sum of its proper divisors (13379963540307).

20201121423021 is a wasteful number, since it uses less digits than its factorization.

20201121423021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87450742112.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 20201121423021 its reverse (12032412110202), we get a palindrome (32233533533223).

The spelling of 20201121423021 in words is "twenty trillion, two hundred one billion, one hundred twenty-one million, four hundred twenty-three thousand, twenty-one".