21936003409 has 8 divisors (see below), whose sum is σ = 22653344168. Its totient is φ = 21225214080.

The previous prime is 21936003407. The next prime is 21936003469. The reversal of 21936003409 is 90430063912.

It can be written as a sum of positive squares in 4 ways, for example, as 364619025 + 21571384384 = 19095^2 + 146872^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21936003409 - 2¹ = 21936003407 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21936003407) 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 in 7 ways as a sum of consecutive naturals, for example, 1631052 + ... + 1644445.

It is an arithmetic number, because the mean of its divisors is an integer number (2831668021).

Almost surely, 2^21936003409 is an apocalyptic number.

It is an amenable number.

21936003409 is a deficient number, since it is larger than the sum of its proper divisors (717340759).

21936003409 is a wasteful number, since it uses less digits than its factorization.

21936003409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3275715.

The product of its (nonzero) digits is 34992, while the sum is 37.

The spelling of 21936003409 in words is "twenty-one billion, nine hundred thirty-six million, three thousand, four hundred nine".