21200061571 has 8 divisors (see below), whose sum is σ = 23087363040. Its totient is φ = 19349406912.

The previous prime is 21200061563. The next prime is 21200061577. The reversal of 21200061571 is 17516000212.

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 21200061571 - 2³ = 21200061563 is a prime.

It is a super-2 number, since 2×21200061571² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21200061577) 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, 9160495 + ... + 9162808.

It is an arithmetic number, because the mean of its divisors is an integer number (2885920380).

Almost surely, 2^21200061571 is an apocalyptic number.

21200061571 is a deficient number, since it is larger than the sum of its proper divisors (1887301469).

21200061571 is a wasteful number, since it uses less digits than its factorization.

21200061571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18323405.

The product of its (nonzero) digits is 840, while the sum is 25.

Adding to 21200061571 its reverse (17516000212), we get a palindrome (38716061783).

The spelling of 21200061571 in words is "twenty-one billion, two hundred million, sixty-one thousand, five hundred seventy-one".