21154533144645 has 16 divisors (see below), whose sum is σ = 33879457864512. Its totient is φ = 11271682732800.

The previous prime is 21154533144601. The next prime is 21154533144673. The reversal of 21154533144645 is 54644133545112.

It is not a de Polignac number, because 21154533144645 - 2⁸ = 21154533144389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21154533144594 and 21154533144603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 670917732 + ... + 670949261.

It is an arithmetic number, because the mean of its divisors is an integer number (2117466116532).

Almost surely, 2^{21154533144645} is an apocalyptic number.

It is an amenable number.

21154533144645 is a deficient number, since it is larger than the sum of its proper divisors (12724924719867).

21154533144645 is a wasteful number, since it uses less digits than its factorization.

21154533144645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1341868052.

The product of its digits is 3456000, while the sum is 48.

Adding to 21154533144645 its reverse (54644133545112), we get a palindrome (75798666689757).

The spelling of 21154533144645 in words is "twenty-one trillion, one hundred fifty-four billion, five hundred thirty-three million, one hundred forty-four thousand, six hundred forty-five".