21440202029 has 2 divisors, whose sum is σ = 21440202030. Its totient is φ = 21440202028.

The previous prime is 21440201987. The next prime is 21440202041. The reversal of 21440202029 is 92020204412.

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., 21435888100 + 4313929 = 146410^2 + 2077^2 .

It is a cyclic number.

It is not a de Polignac number, because 21440202029 - 2¹⁶ = 21440136493 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21440201989 and 21440202007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21440202089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10720101014 + 10720101015.

It is an arithmetic number, because the mean of its divisors is an integer number (10720101015).

Almost surely, 2^21440202029 is an apocalyptic number.

It is an amenable number.

21440202029 is a deficient number, since it is larger than the sum of its proper divisors (1).

21440202029 is an equidigital number, since it uses as much as digits as its factorization.

21440202029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 26.

The spelling of 21440202029 in words is "twenty-one billion, four hundred forty million, two hundred two thousand, twenty-nine".