21405150229 has 2 divisors, whose sum is σ = 21405150230. Its totient is φ = 21405150228.

The previous prime is 21405150223. The next prime is 21405150257. The reversal of 21405150229 is 92205150412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21206058129 + 199092100 = 145623^2 + 14110^2 .

It is a cyclic number.

It is not a de Polignac number, because 21405150229 - 2⁵ = 21405150197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21405150229.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21405150223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10702575114 + 10702575115.

It is an arithmetic number, because the mean of its divisors is an integer number (10702575115).

Almost surely, 2^21405150229 is an apocalyptic number.

It is an amenable number.

21405150229 is a deficient number, since it is larger than the sum of its proper divisors (1).

21405150229 is an equidigital number, since it uses as much as digits as its factorization.

21405150229 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 31.

The spelling of 21405150229 in words is "twenty-one billion, four hundred five million, one hundred fifty thousand, two hundred twenty-nine".