20122202021021 has 4 divisors (see below), whose sum is σ = 21305860963452. Its totient is φ = 18938543078592.

The previous prime is 20122202021017. The next prime is 20122202021039. The reversal of 20122202021021 is 12012020222102.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 16024569424900 + 4097632596121 = 4003070^2 + 2024261^2 .

It is a cyclic number.

It is not a de Polignac number, because 20122202021021 - 2² = 20122202021017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 1183658942413 = 20122202021021 / (2 + 0 + 1 + 2 + 2 + 2 + 0 + 2 + 0 + 2 + 1 + 0 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20122202021011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 591829471190 + ... + 591829471223.

It is an arithmetic number, because the mean of its divisors is an integer number (5326465240863).

Almost surely, 2^{20122202021021} is an apocalyptic number.

It is an amenable number.

20122202021021 is a deficient number, since it is larger than the sum of its proper divisors (1183658942431).

20122202021021 is a wasteful number, since it uses less digits than its factorization.

20122202021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1183658942430.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 20122202021021 its reverse (12012020222102), we get a palindrome (32134222243123).

The spelling of 20122202021021 in words is "twenty trillion, one hundred twenty-two billion, two hundred two million, twenty-one thousand, twenty-one".