21130033542 has 16 divisors (see below), whose sum is σ = 42273653760. Its totient is φ = 7041080072.

The previous prime is 21130033531. The next prime is 21130033609. The reversal of 21130033542 is 24533003112.

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 7 ways as a sum of consecutive naturals, for example, 545838 + ... + 583265.

It is an arithmetic number, because the mean of its divisors is an integer number (2642103360).

Almost surely, 2^21130033542 is an apocalyptic number.

21130033542 is an abundant number, since it is smaller than the sum of its proper divisors (21143620218).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21130033542 is a wasteful number, since it uses less digits than its factorization.

21130033542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1132227.

The product of its (nonzero) digits is 2160, while the sum is 24.

Adding to 21130033542 its reverse (24533003112), we get a palindrome (45663036654).

The spelling of 21130033542 in words is "twenty-one billion, one hundred thirty million, thirty-three thousand, five hundred forty-two".