21434021029 has 2 divisors, whose sum is σ = 21434021030. Its totient is φ = 21434021028.

The previous prime is 21434021027. The next prime is 21434021051. The reversal of 21434021029 is 92012043412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19225209025 + 2208812004 = 138655^2 + 46998^2 .

It is a cyclic number.

It is not a de Polignac number, because 21434021029 - 2¹ = 21434021027 is a prime.

It is a super-2 number, since 2×21434021029² (a number of 21 digits) contains 22 as substring.

Together with 21434021027, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 21434020988 and 21434021006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21434021027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10717010514 + 10717010515.

It is an arithmetic number, because the mean of its divisors is an integer number (10717010515).

Almost surely, 2^21434021029 is an apocalyptic number.

It is an amenable number.

21434021029 is a deficient number, since it is larger than the sum of its proper divisors (1).

21434021029 is an equidigital number, since it uses as much as digits as its factorization.

21434021029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 28.

The spelling of 21434021029 in words is "twenty-one billion, four hundred thirty-four million, twenty-one thousand, twenty-nine".