21225135011 has 8 divisors (see below), whose sum is σ = 23313649920. Its totient is φ = 19233760392.

The previous prime is 21225134993. The next prime is 21225135017. The reversal of 21225135011 is 11053152212.

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 21225135011 - 2⁶ = 21225134947 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21225135017) 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, 24284615 + ... + 24285488.

It is an arithmetic number, because the mean of its divisors is an integer number (2914206240).

Almost surely, 2^21225135011 is an apocalyptic number.

21225135011 is a deficient number, since it is larger than the sum of its proper divisors (2088514909).

21225135011 is a wasteful number, since it uses less digits than its factorization.

21225135011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48570145.

The product of its (nonzero) digits is 600, while the sum is 23.

Adding to 21225135011 its reverse (11053152212), we get a palindrome (32278287223).

The spelling of 21225135011 in words is "twenty-one billion, two hundred twenty-five million, one hundred thirty-five thousand, eleven".