20212021201 has 4 divisors (see below), whose sum is σ = 20347672500. Its totient is φ = 20076369904.

The previous prime is 20212021199. The next prime is 20212021211. The reversal of 20212021201 is 10212021202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10212021202 = 2 ⋅5106010601.

It can be written as a sum of positive squares in 2 ways, for example, as 9848577600 + 10363443601 = 99240^2 + 101801^2 .

It is a cyclic number.

It is not a de Polignac number, because 20212021201 - 2¹ = 20212021199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20212021211) 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, 67825426 + ... + 67825723.

It is an arithmetic number, because the mean of its divisors is an integer number (5086918125).

Almost surely, 2^20212021201 is an apocalyptic number.

It is an amenable number.

20212021201 is a deficient number, since it is larger than the sum of its proper divisors (135651299).

20212021201 is a wasteful number, since it uses less digits than its factorization.

20212021201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135651298.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20212021201 its reverse (10212021202), we get a palindrome (30424042403).

Subtracting from 20212021201 its reverse (10212021202), we obtain a palindrome (9999999999).

The spelling of 20212021201 in words is "twenty billion, two hundred twelve million, twenty-one thousand, two hundred one".