21623522055145 has 16 divisors (see below), whose sum is σ = 26333293432320. Its totient is φ = 17043705782784.

The previous prime is 21623522055139. The next prime is 21623522055167. The reversal of 21623522055145 is 54155022532612.

It is a cyclic number.

It is not a de Polignac number, because 21623522055145 - 2⁹ = 21623522054633 is a prime.

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, 99857275 + ... + 100073584.

It is an arithmetic number, because the mean of its divisors is an integer number (1645830839520).

Almost surely, 2^{21623522055145} is an apocalyptic number.

It is an amenable number.

21623522055145 is a deficient number, since it is larger than the sum of its proper divisors (4709771377175).

21623522055145 is a wasteful number, since it uses less digits than its factorization.

21623522055145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199931184.

The product of its (nonzero) digits is 720000, while the sum is 43.

Adding to 21623522055145 its reverse (54155022532612), we get a palindrome (75778544587757).

The spelling of 21623522055145 in words is "twenty-one trillion, six hundred twenty-three billion, five hundred twenty-two million, fifty-five thousand, one hundred forty-five".