21134324421 has 12 divisors (see below), whose sum is σ = 34888408672. Its totient is φ = 12076756776.

The previous prime is 21134324417. The next prime is 21134324429. The reversal of 21134324421 is 12442343112.

21134324421 is a `hidden beast` number, since 211 + 3 + 4 + 3 + 2 + 442 + 1 = 666.

It is not a de Polignac number, because 21134324421 - 2² = 21134324417 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21134324429) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 167732671 + ... + 167732796.

Almost surely, 2^21134324421 is an apocalyptic number.

21134324421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21134324421 is a deficient number, since it is larger than the sum of its proper divisors (13754084251).

21134324421 is a wasteful number, since it uses less digits than its factorization.

21134324421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335465480 (or 335465477 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

Adding to 21134324421 its reverse (12442343112), we get a palindrome (33576667533).

The spelling of 21134324421 in words is "twenty-one billion, one hundred thirty-four million, three hundred twenty-four thousand, four hundred twenty-one".