21152243445 has 32 divisors (see below), whose sum is σ = 35156056320. Its totient is φ = 10846940160.

The previous prime is 21152243381. The next prime is 21152243447. The reversal of 21152243445 is 54434225112.

It is not a de Polignac number, because 21152243445 - 2⁶ = 21152243381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21152243447) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3952 + ... + 205718.

It is an arithmetic number, because the mean of its divisors is an integer number (1098626760).

Almost surely, 2^21152243445 is an apocalyptic number.

It is an amenable number.

21152243445 is a deficient number, since it is larger than the sum of its proper divisors (14003812875).

21152243445 is a wasteful number, since it uses less digits than its factorization.

21152243445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202045.

The product of its digits is 38400, while the sum is 33.

Adding to 21152243445 its reverse (54434225112), we get a palindrome (75586468557).

The spelling of 21152243445 in words is "twenty-one billion, one hundred fifty-two million, two hundred forty-three thousand, four hundred forty-five".