21534276707 has 4 divisors (see below), whose sum is σ = 21535592640. Its totient is φ = 21532960776.

The previous prime is 21534276691. The next prime is 21534276727. The reversal of 21534276707 is 70767243512.

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 21534276707 - 2⁴ = 21534276691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21534276727) 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 3 ways as a sum of consecutive naturals, for example, 633107 + ... + 666252.

It is an arithmetic number, because the mean of its divisors is an integer number (5383898160).

Almost surely, 2^21534276707 is an apocalyptic number.

21534276707 is a deficient number, since it is larger than the sum of its proper divisors (1315933).

21534276707 is a wasteful number, since it uses less digits than its factorization.

21534276707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1315932.

The product of its (nonzero) digits is 493920, while the sum is 44.

The spelling of 21534276707 in words is "twenty-one billion, five hundred thirty-four million, two hundred seventy-six thousand, seven hundred seven".