21520051041 has 8 divisors (see below), whose sum is σ = 28695721824. Its totient is φ = 14345540480.

The previous prime is 21520051031. The next prime is 21520051051. The reversal of 21520051041 is 14015002512.

It is an interprime number because it is at equal distance from previous prime (21520051031) and next prime (21520051051).

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 21520051041 - 2¹⁰ = 21520050017 is a prime.

It is a super-2 number, since 2×21520051041² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21520050999 and 21520051017.

It is not an unprimeable number, because it can be changed into a prime (21520051031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 245811 + ... + 321656.

It is an arithmetic number, because the mean of its divisors is an integer number (3586965228).

Almost surely, 2^21520051041 is an apocalyptic number.

It is an amenable number.

21520051041 is a deficient number, since it is larger than the sum of its proper divisors (7175670783).

21520051041 is a wasteful number, since it uses less digits than its factorization.

21520051041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580111.

The product of its (nonzero) digits is 400, while the sum is 21.

Adding to 21520051041 its reverse (14015002512), we get a palindrome (35535053553).

The spelling of 21520051041 in words is "twenty-one billion, five hundred twenty million, fifty-one thousand, forty-one".