21077743542 has 8 divisors (see below), whose sum is σ = 42155487096. Its totient is φ = 7025914512.

The previous prime is 21077743501. The next prime is 21077743567. The reversal of 21077743542 is 24534777012.

It is a sphenic number, since it is the product of 3 distinct primes.

21077743542 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 21077743494 and 21077743503.

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 3 ways as a sum of consecutive naturals, for example, 1756478623 + ... + 1756478634.

It is an arithmetic number, because the mean of its divisors is an integer number (5269435887).

Almost surely, 2^21077743542 is an apocalyptic number.

21077743542 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21077743542 is a wasteful number, since it uses less digits than its factorization.

21077743542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3512957262.

The product of its (nonzero) digits is 329280, while the sum is 42.

The spelling of 21077743542 in words is "twenty-one billion, seventy-seven million, seven hundred forty-three thousand, five hundred forty-two".