21635113026 has 16 divisors (see below), whose sum is σ = 43674621984. Its totient is φ = 7144305024.

The previous prime is 21635112979. The next prime is 21635113037. The reversal of 21635113026 is 62031153612.

It is a junction number, because it is equal to n+sod(n) for n = 21635112984 and 21635113002.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16849135 + ... + 16850418.

It is an arithmetic number, because the mean of its divisors is an integer number (2729663874).

Almost surely, 2^21635113026 is an apocalyptic number.

21635113026 is an abundant number, since it is smaller than the sum of its proper divisors (22039508958).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21635113026 is a wasteful number, since it uses less digits than its factorization.

21635113026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33699665.

The product of its (nonzero) digits is 6480, while the sum is 30.

Adding to 21635113026 its reverse (62031153612), we get a palindrome (83666266638).

The spelling of 21635113026 in words is "twenty-one billion, six hundred thirty-five million, one hundred thirteen thousand, twenty-six".