21436005554 has 8 divisors (see below), whose sum is σ = 32158138860. Its totient is φ = 10716625936.

The previous prime is 21436005529. The next prime is 21436005583. The reversal of 21436005554 is 45550063412.

It can be written as a sum of positive squares in 2 ways, for example, as 21338489929 + 97515625 = 146077^2 + 9875^2 .

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

It is a super-2 number, since 2×21436005554² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 668849 + ... + 700164.

Almost surely, 2^21436005554 is an apocalyptic number.

21436005554 is a deficient number, since it is larger than the sum of its proper divisors (10722133306).

21436005554 is a wasteful number, since it uses less digits than its factorization.

21436005554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1376844.

The product of its (nonzero) digits is 72000, while the sum is 35.

Adding to 21436005554 its reverse (45550063412), we get a palindrome (66986068966).

The spelling of 21436005554 in words is "twenty-one billion, four hundred thirty-six million, five thousand, five hundred fifty-four".