21444002029 has 2 divisors, whose sum is σ = 21444002030. Its totient is φ = 21444002028.

The previous prime is 21444001981. The next prime is 21444002057. The reversal of 21444002029 is 92020044412.

It is an a-pointer prime, because the next prime (21444002057) can be obtained adding 21444002029 to its sum of digits (28).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19621565929 + 1822436100 = 140077^2 + 42690^2 .

It is a cyclic number.

It is not a de Polignac number, because 21444002029 - 2¹¹ = 21443999981 is a prime.

It is a super-2 number, since 2×21444002029² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21444001988 and 21444002006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21444000029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10722001014 + 10722001015.

It is an arithmetic number, because the mean of its divisors is an integer number (10722001015).

Almost surely, 2^21444002029 is an apocalyptic number.

It is an amenable number.

21444002029 is a deficient number, since it is larger than the sum of its proper divisors (1).

21444002029 is an equidigital number, since it uses as much as digits as its factorization.

21444002029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 28.

The spelling of 21444002029 in words is "twenty-one billion, four hundred forty-four million, two thousand, twenty-nine".