20212221210121 has 8 divisors (see below), whose sum is σ = 21091065347520. Its totient is φ = 19333381398672.

The previous prime is 20212221210119. The next prime is 20212221210131. The reversal of 20212221210121 is 12101212221202.

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 20212221210121 - 2¹ = 20212221210119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20212221210101) 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, 11660671 + ... + 13281403.

It is an arithmetic number, because the mean of its divisors is an integer number (2636383168440).

Almost surely, 2^{20212221210121} is an apocalyptic number.

It is an amenable number.

20212221210121 is a deficient number, since it is larger than the sum of its proper divisors (878844137399).

20212221210121 is a wasteful number, since it uses less digits than its factorization.

20212221210121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2162975.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 20212221210121 its reverse (12101212221202), we get a palindrome (32313433431323).

The spelling of 20212221210121 in words is "twenty trillion, two hundred twelve billion, two hundred twenty-one million, two hundred ten thousand, one hundred twenty-one".