21573830139 has 8 divisors (see below), whose sum is σ = 29466694992. Its totient is φ = 14031759360.

The previous prime is 21573830111. The next prime is 21573830143. The reversal of 21573830139 is 93103837512.

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

It is not a de Polignac number, because 21573830139 - 2⁵ = 21573830107 is a prime.

It is a super-3 number, since 3×21573830139³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21573830139.

It is not an unprimeable number, because it can be changed into a prime (21573830039) by changing a digit.

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, 87698374 + ... + 87698619.

It is an arithmetic number, because the mean of its divisors is an integer number (3683336874).

Almost surely, 2^21573830139 is an apocalyptic number.

21573830139 is a deficient number, since it is larger than the sum of its proper divisors (7892864853).

21573830139 is a wasteful number, since it uses less digits than its factorization.

21573830139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175397037.

The product of its (nonzero) digits is 136080, while the sum is 42.

It can be divided in two parts, 2157 and 3830139, that added together give a triangular number (3832296 = T₂₇₆₈).

The spelling of 21573830139 in words is "twenty-one billion, five hundred seventy-three million, eight hundred thirty thousand, one hundred thirty-nine".