21174757542 has 24 divisors (see below), whose sum is σ = 45893089944. Its totient is φ = 7056029664.

The previous prime is 21174757523. The next prime is 21174757543. The reversal of 21174757542 is 24575747112.

It is a happy number.

21174757542 is a `hidden beast` number, since 2 + 1 + 1 + 74 + 7 + 575 + 4 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21174757543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 125983 + ... + 241290.

It is an arithmetic number, because the mean of its divisors is an integer number (1912212081).

Almost surely, 2^21174757542 is an apocalyptic number.

21174757542 is an abundant number, since it is smaller than the sum of its proper divisors (24718332402).

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

21174757542 is a wasteful number, since it uses less digits than its factorization.

21174757542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370484 (or 370481 counting only the distinct ones).

The product of its digits is 548800, while the sum is 45.

The spelling of 21174757542 in words is "twenty-one billion, one hundred seventy-four million, seven hundred fifty-seven thousand, five hundred forty-two".