20210433121 has 2 divisors, whose sum is σ = 20210433122. Its totient is φ = 20210433120.

The previous prime is 20210433083. The next prime is 20210433143. The reversal of 20210433121 is 12133401202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15515442721 + 4694990400 = 124561^2 + 68520^2 .

It is a cyclic number.

It is not a de Polignac number, because 20210433121 - 2⁷ = 20210432993 is a prime.

It is not a weakly prime, because it can be changed into another prime (20210433161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105216560 + 10105216561.

It is an arithmetic number, because the mean of its divisors is an integer number (10105216561).

Almost surely, 2^20210433121 is an apocalyptic number.

It is an amenable number.

20210433121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20210433121 is an equidigital number, since it uses as much as digits as its factorization.

20210433121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 20210433121 its reverse (12133401202), we get a palindrome (32343834323).

It can be divided in two parts, 202104 and 33121, that added together give a square (235225 = 485²).

The spelling of 20210433121 in words is "twenty billion, two hundred ten million, four hundred thirty-three thousand, one hundred twenty-one".