21400134221 has 8 divisors (see below), whose sum is σ = 21536253024. Its totient is φ = 21264074640.

The previous prime is 21400134209. The next prime is 21400134229. The reversal of 21400134221 is 12243100412.

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 21400134221 - 2¹⁰ = 21400133197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21400134193 and 21400134202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21400134229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 880766 + ... + 904736.

It is an arithmetic number, because the mean of its divisors is an integer number (2692031628).

Almost surely, 2^21400134221 is an apocalyptic number.

It is an amenable number.

21400134221 is a deficient number, since it is larger than the sum of its proper divisors (136118803).

21400134221 is a wasteful number, since it uses less digits than its factorization.

21400134221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29611.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21400134221 its reverse (12243100412), we get a palindrome (33643234633).

The spelling of 21400134221 in words is "twenty-one billion, four hundred million, one hundred thirty-four thousand, two hundred twenty-one".