21521113035 has 16 divisors (see below), whose sum is σ = 34768091904. Its totient is φ = 11366489952.

The previous prime is 21521112941. The next prime is 21521113049. The reversal of 21521113035 is 53031112512.

It is not a de Polignac number, because 21521113035 - 2⁹ = 21521112523 is a prime.

It is a super-2 number, since 2×21521113035² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21521112996 and 21521113014.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6963217 + ... + 6966306.

It is an arithmetic number, because the mean of its divisors is an integer number (2173005744).

Almost surely, 2^21521113035 is an apocalyptic number.

21521113035 is a deficient number, since it is larger than the sum of its proper divisors (13246978869).

21521113035 is a wasteful number, since it uses less digits than its factorization.

21521113035 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13929634.

The product of its (nonzero) digits is 900, while the sum is 24.

Adding to 21521113035 its reverse (53031112512), we get a palindrome (74552225547).

The spelling of 21521113035 in words is "twenty-one billion, five hundred twenty-one million, one hundred thirteen thousand, thirty-five".