21534213530 has 16 divisors (see below), whose sum is σ = 39418561440. Its totient is φ = 8467690512.

The previous prime is 21534213529. The next prime is 21534213563. The reversal of 21534213530 is 3531243512.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21534213493 and 21534213502.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18248744 + ... + 18249923.

It is an arithmetic number, because the mean of its divisors is an integer number (2463660090).

Almost surely, 2^21534213530 is an apocalyptic number.

21534213530 is a deficient number, since it is larger than the sum of its proper divisors (17884347910).

21534213530 is a wasteful number, since it uses less digits than its factorization.

21534213530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36498733.

The product of its (nonzero) digits is 10800, while the sum is 29.

The spelling of 21534213530 in words is "twenty-one billion, five hundred thirty-four million, two hundred thirteen thousand, five hundred thirty".