21153746747 has 8 divisors (see below), whose sum is σ = 25009356000. Its totient is φ = 17506548864.

The previous prime is 21153746707. The next prime is 21153746771. The reversal of 21153746747 is 74764735112.

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

It is a de Polignac number, because none of the positive numbers 2^k-21153746747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21153746707) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52102622 + ... + 52103027.

It is an arithmetic number, because the mean of its divisors is an integer number (3126169500).

Almost surely, 2^21153746747 is an apocalyptic number.

21153746747 is a deficient number, since it is larger than the sum of its proper divisors (3855609253).

21153746747 is a wasteful number, since it uses less digits than its factorization.

21153746747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104205685.

The product of its digits is 987840, while the sum is 47.

The spelling of 21153746747 in words is "twenty-one billion, one hundred fifty-three million, seven hundred forty-six thousand, seven hundred forty-seven".