21203001121 has 2 divisors, whose sum is σ = 21203001122. Its totient is φ = 21203001120.

The previous prime is 21203001097. The next prime is 21203001133. The reversal of 21203001121 is 12110030212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19016410000 + 2186591121 = 137900^2 + 46761^2 .

It is a cyclic number.

It is not a de Polignac number, because 21203001121 - 2⁷ = 21203000993 is a prime.

It is a super-3 number, since 3×21203001121³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (21203001161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601500560 + 10601500561.

It is an arithmetic number, because the mean of its divisors is an integer number (10601500561).

Almost surely, 2^21203001121 is an apocalyptic number.

It is an amenable number.

21203001121 is a deficient number, since it is larger than the sum of its proper divisors (1).

21203001121 is an equidigital number, since it uses as much as digits as its factorization.

21203001121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21203001121 its reverse (12110030212), we get a palindrome (33313031333).

The spelling of 21203001121 in words is "twenty-one billion, two hundred three million, one thousand, one hundred twenty-one".