21151145545 has 8 divisors (see below), whose sum is σ = 25382231424. Its totient is φ = 16920345264.

The previous prime is 21151145443. The next prime is 21151145567. The reversal of 21151145545 is 54554115112.

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 21151145545 - 2²³ = 21142756937 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21151145545.

It is an unprimeable number.

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, 159312 + ... + 260158.

It is an arithmetic number, because the mean of its divisors is an integer number (3172778928).

Almost surely, 2^21151145545 is an apocalyptic number.

It is an amenable number.

21151145545 is a deficient number, since it is larger than the sum of its proper divisors (4231085879).

21151145545 is a wasteful number, since it uses less digits than its factorization.

21151145545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142799.

The product of its digits is 20000, while the sum is 34.

The spelling of 21151145545 in words is "twenty-one billion, one hundred fifty-one million, one hundred forty-five thousand, five hundred forty-five".