21033052542 has 16 divisors (see below), whose sum is σ = 46740116880. Its totient is φ = 7011017496.

The previous prime is 21033052529. The next prime is 21033052559. The reversal of 21033052542 is 24525033012.

It is a happy number.

21033052542 is a `hidden beast` number, since 2 + 103 + 30 + 525 + 4 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 194750433 + ... + 194750540.

It is an arithmetic number, because the mean of its divisors is an integer number (2921257305).

Almost surely, 2^21033052542 is an apocalyptic number.

21033052542 is an abundant number, since it is smaller than the sum of its proper divisors (25707064338).

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

21033052542 is a wasteful number, since it uses less digits than its factorization.

21033052542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389500984 (or 389500978 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

Adding to 21033052542 its reverse (24525033012), we get a palindrome (45558085554).

The spelling of 21033052542 in words is "twenty-one billion, thirty-three million, fifty-two thousand, five hundred forty-two".