21404115136 has 14 divisors (see below), whose sum is σ = 42473791100. Its totient is φ = 10702057536.

The previous prime is 21404115127. The next prime is 21404115151. The reversal of 21404115136 is 63151140412.

It is a super-2 number, since 2×21404115136² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167219586 + ... + 167219713.

Almost surely, 2^21404115136 is an apocalyptic number.

It is an amenable number.

21404115136 is a deficient number, since it is larger than the sum of its proper divisors (21069675964).

21404115136 is an equidigital number, since it uses as much as digits as its factorization.

21404115136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334439311 (or 334439301 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

Adding to 21404115136 its reverse (63151140412), we get a palindrome (84555255548).

The spelling of 21404115136 in words is "twenty-one billion, four hundred four million, one hundred fifteen thousand, one hundred thirty-six".