21374838427429 has 2 divisors, whose sum is σ = 21374838427430. Its totient is φ = 21374838427428.

The previous prime is 21374838427343. The next prime is 21374838427447. The reversal of 21374838427429 is 92472483847312.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20854730623204 + 520107804225 = 4566698^2 + 721185^2 .

It is a cyclic number.

It is not a de Polignac number, because 21374838427429 - 2¹³ = 21374838419237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21374838457429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10687419213714 + 10687419213715.

It is an arithmetic number, because the mean of its divisors is an integer number (10687419213715).

Almost surely, 2^{21374838427429} is an apocalyptic number.

It is an amenable number.

21374838427429 is a deficient number, since it is larger than the sum of its proper divisors (1).

21374838427429 is an equidigital number, since it uses as much as digits as its factorization.

21374838427429 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 130056192, while the sum is 64.

The spelling of 21374838427429 in words is "twenty-one trillion, three hundred seventy-four billion, eight hundred thirty-eight million, four hundred twenty-seven thousand, four hundred twenty-nine".