20221210120021 has 8 divisors (see below), whose sum is σ = 20768342120024. Its totient is φ = 19674110373120.

The previous prime is 20221210119937. The next prime is 20221210120037. The reversal of 20221210120021 is 12002101212202.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 702830722500 + 19518379397521 = 838350^2 + 4417961^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20221210120021 - 2¹¹ = 20221210117973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20221210119977 and 20221210120004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20221210120091) 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, 6789720 + ... + 9302833.

It is an arithmetic number, because the mean of its divisors is an integer number (2596042765003).

Almost surely, 2^{20221210120021} is an apocalyptic number.

It is an amenable number.

20221210120021 is a deficient number, since it is larger than the sum of its proper divisors (547132000003).

20221210120021 is a wasteful number, since it uses less digits than its factorization.

20221210120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16126551.

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

Adding to 20221210120021 its reverse (12002101212202), we get a palindrome (32223311332223).

The spelling of 20221210120021 in words is "twenty trillion, two hundred twenty-one billion, two hundred ten million, one hundred twenty thousand, twenty-one".