21003451229 has 2 divisors, whose sum is σ = 21003451230. Its totient is φ = 21003451228.

The previous prime is 21003451171. The next prime is 21003451267. The reversal of 21003451229 is 92215430012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15757780900 + 5245670329 = 125530^2 + 72427^2 .

It is a cyclic number.

It is not a de Polignac number, because 21003451229 - 2¹² = 21003447133 is a prime.

It is a super-2 number, since 2×21003451229² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21003451279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501725614 + 10501725615.

It is an arithmetic number, because the mean of its divisors is an integer number (10501725615).

Almost surely, 2^21003451229 is an apocalyptic number.

It is an amenable number.

21003451229 is a deficient number, since it is larger than the sum of its proper divisors (1).

21003451229 is an equidigital number, since it uses as much as digits as its factorization.

21003451229 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 29.

The spelling of 21003451229 in words is "twenty-one billion, three million, four hundred fifty-one thousand, two hundred twenty-nine".