21573000007 has 8 divisors (see below), whose sum is σ = 24455222960. Its totient is φ = 18865457280.

The previous prime is 21572999999. The next prime is 21573000011. The reversal of 21573000007 is 70000037512.

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

It is a cyclic number.

It is not a de Polignac number, because 21573000007 - 2³ = 21572999999 is a prime.

It is the 146878-th Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21573000107) by changing a digit.

It is a nontrivial repunit in base 146877.

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, 43669794 + ... + 43670287.

It is an arithmetic number, because the mean of its divisors is an integer number (3056902870).

Almost surely, 2^21573000007 is an apocalyptic number.

21573000007 is a deficient number, since it is larger than the sum of its proper divisors (2882222953).

21573000007 is a wasteful number, since it uses less digits than its factorization.

21573000007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87340113.

The product of its (nonzero) digits is 1470, while the sum is 25.

Adding to 21573000007 its reverse (70000037512), we get a palindrome (91573037519).

The spelling of 21573000007 in words is "twenty-one billion, five hundred seventy-three million, seven", and thus it is an aban number.