21436336043 has 8 divisors (see below), whose sum is σ = 21605196096. Its totient is φ = 21267555400.

The previous prime is 21436336039. The next prime is 21436336067. The reversal of 21436336043 is 34063363412.

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 21436336043 - 2² = 21436336039 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21436335994 and 21436336012.

It is not an unprimeable number, because it can be changed into a prime (21436336073) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 597080 + ... + 631962.

It is an arithmetic number, because the mean of its divisors is an integer number (2700649512).

Almost surely, 2^21436336043 is an apocalyptic number.

21436336043 is a deficient number, since it is larger than the sum of its proper divisors (168860053).

21436336043 is a wasteful number, since it uses less digits than its factorization.

21436336043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39705.

The product of its (nonzero) digits is 93312, while the sum is 35.

Adding to 21436336043 its reverse (34063363412), we get a palindrome (55499699455).

The spelling of 21436336043 in words is "twenty-one billion, four hundred thirty-six million, three hundred thirty-six thousand, forty-three".