21420310129 has 2 divisors, whose sum is σ = 21420310130. Its totient is φ = 21420310128.

The previous prime is 21420310103. The next prime is 21420310133. The reversal of 21420310129 is 92101302412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11193640000 + 10226670129 = 105800^2 + 101127^2 .

It is a cyclic number.

It is not a de Polignac number, because 21420310129 - 2²³ = 21411921521 is a prime.

It is not a weakly prime, because it can be changed into another prime (21420313129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10710155064 + 10710155065.

It is an arithmetic number, because the mean of its divisors is an integer number (10710155065).

Almost surely, 2^21420310129 is an apocalyptic number.

It is an amenable number.

21420310129 is a deficient number, since it is larger than the sum of its proper divisors (1).

21420310129 is an equidigital number, since it uses as much as digits as its factorization.

21420310129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The spelling of 21420310129 in words is "twenty-one billion, four hundred twenty million, three hundred ten thousand, one hundred twenty-nine".