20212121201 has 2 divisors, whose sum is σ = 20212121202. Its totient is φ = 20212121200.

The previous prime is 20212121197. The next prime is 20212121227. The reversal of 20212121201 is 10212121202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19522796176 + 689325025 = 139724^2 + 26255^2 .

It is a cyclic number.

It is not a de Polignac number, because 20212121201 - 2² = 20212121197 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20212121231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106060600 + 10106060601.

It is an arithmetic number, because the mean of its divisors is an integer number (10106060601).

Almost surely, 2^20212121201 is an apocalyptic number.

It is an amenable number.

20212121201 is a deficient number, since it is larger than the sum of its proper divisors (1).

20212121201 is an equidigital number, since it uses as much as digits as its factorization.

20212121201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20212121201 its reverse (10212121202), we get a palindrome (30424242403).

Subtracting from 20212121201 its reverse (10212121202), we obtain a palindrome (9999999999).

It can be divided in two parts, 202121 and 21201, that added together give a palindrome (223322).

The spelling of 20212121201 in words is "twenty billion, two hundred twelve million, one hundred twenty-one thousand, two hundred one".