21625547145 has 64 divisors (see below), whose sum is σ = 36242325504. Its totient is φ = 10998466560.

The previous prime is 21625547107. The next prime is 21625547149. The reversal of 21625547145 is 54174552612.

It is not a de Polignac number, because 21625547145 - 2¹⁴ = 21625530761 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21625547097 and 21625547106.

It is not an unprimeable number, because it can be changed into a prime (21625547149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11861704 + ... + 11863526.

It is an arithmetic number, because the mean of its divisors is an integer number (566286336).

Almost surely, 2^21625547145 is an apocalyptic number.

It is an amenable number.

21625547145 is a deficient number, since it is larger than the sum of its proper divisors (14616778359).

21625547145 is a wasteful number, since it uses less digits than its factorization.

21625547145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2222.

The product of its digits is 336000, while the sum is 42.

The spelling of 21625547145 in words is "twenty-one billion, six hundred twenty-five million, five hundred forty-seven thousand, one hundred forty-five".