21321401436 has 36 divisors (see below), whose sum is σ = 53970789600. Its totient is φ = 7097240448.

The previous prime is 21321401407. The next prime is 21321401447. The reversal of 21321401436 is 63410412312.

It is a happy number.

21321401436 is a `hidden beast` number, since 2 + 13 + 214 + 0 + 1 + 436 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 385981 + ... + 437748.

It is an arithmetic number, because the mean of its divisors is an integer number (1499188600).

Almost surely, 2^21321401436 is an apocalyptic number.

It is an amenable number.

21321401436 is an abundant number, since it is smaller than the sum of its proper divisors (32649388164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21321401436 is a wasteful number, since it uses less digits than its factorization.

21321401436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 824458 (or 824453 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

Adding to 21321401436 its reverse (63410412312), we get a palindrome (84731813748).

The spelling of 21321401436 in words is "twenty-one billion, three hundred twenty-one million, four hundred one thousand, four hundred thirty-six".