20121022201021 has 32 divisors (see below), whose sum is σ = 23970975694848. Its totient is φ = 16525949685120.

The previous prime is 20121022201019. The next prime is 20121022201081. The reversal of 20121022201021 is 12010222012102.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20121022201021 - 2¹ = 20121022201019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20121022200986 and 20121022201004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121022201081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 174660186 + ... + 174775348.

It is an arithmetic number, because the mean of its divisors is an integer number (749092990464).

Almost surely, 2^{20121022201021} is an apocalyptic number.

It is an amenable number.

20121022201021 is a deficient number, since it is larger than the sum of its proper divisors (3849953493827).

20121022201021 is a wasteful number, since it uses less digits than its factorization.

20121022201021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123121.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20121022201021 its reverse (12010222012102), we get a palindrome (32131244213123).

The spelling of 20121022201021 in words is "twenty trillion, one hundred twenty-one billion, twenty-two million, two hundred one thousand, twenty-one".