21340680467 has 4 divisors (see below), whose sum is σ = 21372966576. Its totient is φ = 21308394360.

The previous prime is 21340680463. The next prime is 21340680553. The reversal of 21340680467 is 76408604312.

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 21340680467 - 2² = 21340680463 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21340680463) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16142063 + ... + 16143384.

It is an arithmetic number, because the mean of its divisors is an integer number (5343241644).

Almost surely, 2^21340680467 is an apocalyptic number.

21340680467 is a deficient number, since it is larger than the sum of its proper divisors (32286109).

21340680467 is an equidigital number, since it uses as much as digits as its factorization.

21340680467 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32286108.

The product of its (nonzero) digits is 193536, while the sum is 41.

The spelling of 21340680467 in words is "twenty-one billion, three hundred forty million, six hundred eighty thousand, four hundred sixty-seven".