21194000829 has 6 divisors (see below), whose sum is σ = 30613556766. Its totient is φ = 14129333880.

The previous prime is 21194000791. The next prime is 21194000837. The reversal of 21194000829 is 92800049112.

It can be written as a sum of positive squares in only one way, i.e., 20370425625 + 823575204 = 142725^2 + 28698^2 .

It is not a de Polignac number, because 21194000829 - 2¹¹ = 21193998781 is a prime.

It is a super-2 number, since 2×21194000829² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21194000793 and 21194000802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21194000869) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1177444482 + ... + 1177444499.

It is an arithmetic number, because the mean of its divisors is an integer number (5102259461).

Almost surely, 2^21194000829 is an apocalyptic number.

It is an amenable number.

21194000829 is a deficient number, since it is larger than the sum of its proper divisors (9419555937).

21194000829 is a wasteful number, since it uses less digits than its factorization.

21194000829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2354888987 (or 2354888984 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The spelling of 21194000829 in words is "twenty-one billion, one hundred ninety-four million, eight hundred twenty-nine", and thus it is an aban number.