20222121002021 has 8 divisors (see below), whose sum is σ = 20643385044600. Its totient is φ = 19803752245440.

The previous prime is 20222121002009. The next prime is 20222121002023. The reversal of 20222121002021 is 12020012122202.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1994464185025 + 18227656816996 = 1412255^2 + 4269386^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20222121002021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20222121002023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 723807386 + ... + 723835323.

It is an arithmetic number, because the mean of its divisors is an integer number (2580423130575).

Almost surely, 2^{20222121002021} is an apocalyptic number.

It is an amenable number.

20222121002021 is a deficient number, since it is larger than the sum of its proper divisors (421264042579).

20222121002021 is a wasteful number, since it uses less digits than its factorization.

20222121002021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1447642999.

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

Adding to 20222121002021 its reverse (12020012122202), we get a palindrome (32242133124223).

The spelling of 20222121002021 in words is "twenty trillion, two hundred twenty-two billion, one hundred twenty-one million, two thousand, twenty-one".