21812429520139 has 2 divisors, whose sum is σ = 21812429520140. Its totient is φ = 21812429520138.

The previous prime is 21812429520121. The next prime is 21812429520143. The reversal of 21812429520139 is 93102592421812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21812429520139 - 2²⁹ = 21811892649227 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21812429520092 and 21812429520101.

It is not a weakly prime, because it can be changed into another prime (21812429520149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10906214760069 + 10906214760070.

It is an arithmetic number, because the mean of its divisors is an integer number (10906214760070).

Almost surely, 2^{21812429520139} is an apocalyptic number.

21812429520139 is a deficient number, since it is larger than the sum of its proper divisors (1).

21812429520139 is an equidigital number, since it uses as much as digits as its factorization.

21812429520139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 622080, while the sum is 49.

The spelling of 21812429520139 in words is "twenty-one trillion, eight hundred twelve billion, four hundred twenty-nine million, five hundred twenty thousand, one hundred thirty-nine".