21247367673 has 8 divisors (see below), whose sum is σ = 32376941248. Its totient is φ = 12141352944.

The previous prime is 21247367657. The next prime is 21247367689. The reversal of 21247367673 is 37676374212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21247367657) and next prime (21247367689).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21247367673 - 2⁴ = 21247367657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21247367653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 505889686 + ... + 505889727.

It is an arithmetic number, because the mean of its divisors is an integer number (4047117656).

Almost surely, 2^21247367673 is an apocalyptic number.

It is an amenable number.

21247367673 is a deficient number, since it is larger than the sum of its proper divisors (11129573575).

21247367673 is a wasteful number, since it uses less digits than its factorization.

21247367673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1011779423.

The product of its digits is 1778112, while the sum is 48.

The spelling of 21247367673 in words is "twenty-one billion, two hundred forty-seven million, three hundred sixty-seven thousand, six hundred seventy-three".