21350445524 has 12 divisors (see below), whose sum is σ = 37366192500. Its totient is φ = 10674390528.

The previous prime is 21350445517. The next prime is 21350445533. The reversal of 21350445524 is 42554405312.

It can be written as a sum of positive squares in 2 ways, for example, as 6204712900 + 15145732624 = 78770^2 + 123068^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148439 + ... + 254430.

It is an arithmetic number, because the mean of its divisors is an integer number (3113849375).

Almost surely, 2^21350445524 is an apocalyptic number.

It is an amenable number.

21350445524 is a deficient number, since it is larger than the sum of its proper divisors (16015746976).

21350445524 is a wasteful number, since it uses less digits than its factorization.

21350445524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416122 (or 416120 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 35.

The spelling of 21350445524 in words is "twenty-one billion, three hundred fifty million, four hundred forty-five thousand, five hundred twenty-four".