20122021021021 has 4 divisors (see below), whose sum is σ = 20771118473344. Its totient is φ = 19472923568700.

The previous prime is 20122021020961. The next prime is 20122021021027. The reversal of 20122021021021 is 12012012022102.

It is a happy number.

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 20122021021021 - 2⁹ = 20122021020509 is a prime.

It is a super-2 number, since 2×20122021021021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20122021020986 and 20122021021004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20122021021027) 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, 324548726115 + ... + 324548726176.

It is an arithmetic number, because the mean of its divisors is an integer number (5192779618336).

Almost surely, 2^{20122021021021} is an apocalyptic number.

It is an amenable number.

20122021021021 is a deficient number, since it is larger than the sum of its proper divisors (649097452323).

20122021021021 is an equidigital number, since it uses as much as digits as its factorization.

20122021021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649097452322.

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

Adding to 20122021021021 its reverse (12012012022102), we get a palindrome (32134033043123).

The spelling of 20122021021021 in words is "twenty trillion, one hundred twenty-two billion, twenty-one million, twenty-one thousand, twenty-one".