21752240542 has 16 divisors (see below), whose sum is σ = 32721436800. Its totient is φ = 10845139032.

The previous prime is 21752240519. The next prime is 21752240551. The reversal of 21752240542 is 24504225712.

It is a junction number, because it is equal to n+sod(n) for n = 21752240498 and 21752240507.

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, 1047553 + ... + 1068115.

It is an arithmetic number, because the mean of its divisors is an integer number (2045089800).

Almost surely, 2^21752240542 is an apocalyptic number.

21752240542 is a deficient number, since it is larger than the sum of its proper divisors (10969196258).

21752240542 is a wasteful number, since it uses less digits than its factorization.

21752240542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22047.

The product of its (nonzero) digits is 44800, while the sum is 34.

It can be divided in two parts, 217522 and 40542, that added together give a square (258064 = 508²).

The spelling of 21752240542 in words is "twenty-one billion, seven hundred fifty-two million, two hundred forty thousand, five hundred forty-two".