21436407127 has 4 divisors (see below), whose sum is σ = 21449632936. Its totient is φ = 21423181320.

The previous prime is 21436407121. The next prime is 21436407151. The reversal of 21436407127 is 72170463412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21436407127 - 2³ = 21436407119 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 (21436407121) by changing a digit.

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, 6610473 + ... + 6613714.

It is an arithmetic number, because the mean of its divisors is an integer number (5362408234).

Almost surely, 2^21436407127 is an apocalyptic number.

21436407127 is a deficient number, since it is larger than the sum of its proper divisors (13225809).

21436407127 is a wasteful number, since it uses less digits than its factorization.

21436407127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13225808.

The product of its (nonzero) digits is 56448, while the sum is 37.

The spelling of 21436407127 in words is "twenty-one billion, four hundred thirty-six million, four hundred seven thousand, one hundred twenty-seven".