21630226121 has 8 divisors (see below), whose sum is σ = 24735372480. Its totient is φ = 18528858288.

The previous prime is 21630226109. The next prime is 21630226129. The reversal of 21630226121 is 12162203612.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21630226121 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21630226129) 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, 932351 + ... + 955268.

It is an arithmetic number, because the mean of its divisors is an integer number (3091921560).

Almost surely, 2^21630226121 is an apocalyptic number.

It is an amenable number.

21630226121 is a deficient number, since it is larger than the sum of its proper divisors (3105146359).

21630226121 is a wasteful number, since it uses less digits than its factorization.

21630226121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1889263.

The product of its (nonzero) digits is 1728, while the sum is 26.

Adding to 21630226121 its reverse (12162203612), we get a palindrome (33792429733).

The spelling of 21630226121 in words is "twenty-one billion, six hundred thirty million, two hundred twenty-six thousand, one hundred twenty-one".