21403333129 has 2 divisors, whose sum is σ = 21403333130. Its totient is φ = 21403333128.

The previous prime is 21403333109. The next prime is 21403333201. The reversal of 21403333129 is 92133330412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12632636025 + 8770697104 = 112395^2 + 93652^2 .

It is a cyclic number.

It is not a de Polignac number, because 21403333129 - 2⁷ = 21403333001 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21403333129.

It is not a weakly prime, because it can be changed into another prime (21403333109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10701666564 + 10701666565.

It is an arithmetic number, because the mean of its divisors is an integer number (10701666565).

Almost surely, 2^21403333129 is an apocalyptic number.

It is an amenable number.

21403333129 is a deficient number, since it is larger than the sum of its proper divisors (1).

21403333129 is an equidigital number, since it uses as much as digits as its factorization.

21403333129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 31.

The spelling of 21403333129 in words is "twenty-one billion, four hundred three million, three hundred thirty-three thousand, one hundred twenty-nine".