21214054145 has 16 divisors (see below), whose sum is σ = 25824718080. Its totient is φ = 16726180800.

The previous prime is 21214054111. The next prime is 21214054157. The reversal of 21214054145 is 54145041212.

It is a happy number.

It is not a de Polignac number, because 21214054145 - 2¹⁰ = 21214053121 is a prime.

It is a Curzon 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, 1152071 + ... + 1170339.

It is an arithmetic number, because the mean of its divisors is an integer number (1614044880).

Almost surely, 2^21214054145 is an apocalyptic number.

It is an amenable number.

21214054145 is a deficient number, since it is larger than the sum of its proper divisors (4610663935).

21214054145 is a wasteful number, since it uses less digits than its factorization.

21214054145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21616.

The product of its (nonzero) digits is 6400, while the sum is 29.

Adding to 21214054145 its reverse (54145041212), we get a palindrome (75359095357).

The spelling of 21214054145 in words is "twenty-one billion, two hundred fourteen million, fifty-four thousand, one hundred forty-five".