21275045851 has 8 divisors (see below), whose sum is σ = 21519766800. Its totient is φ = 21030451200.

The previous prime is 21275045821. The next prime is 21275045861. The reversal of 21275045851 is 15854057212.

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

It is a cyclic number.

It is not a de Polignac number, because 21275045851 - 2⁹ = 21275045339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21275045821) 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, 331035 + ... + 390043.

It is an arithmetic number, because the mean of its divisors is an integer number (2689970850).

Almost surely, 2^21275045851 is an apocalyptic number.

21275045851 is a deficient number, since it is larger than the sum of its proper divisors (244720949).

21275045851 is an equidigital number, since it uses as much as digits as its factorization.

21275045851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63149.

The product of its (nonzero) digits is 112000, while the sum is 40.

The spelling of 21275045851 in words is "twenty-one billion, two hundred seventy-five million, forty-five thousand, eight hundred fifty-one".