21630223110261 has 8 divisors (see below), whose sum is σ = 28840422929344. Its totient is φ = 14420086015680.

The previous prime is 21630223110247. The next prime is 21630223110281. The reversal of 21630223110261 is 16201132203612.

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

It is not a de Polignac number, because 21630223110261 - 2¹³ = 21630223102069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21630223110211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14870500 + ... + 16260141.

It is an arithmetic number, because the mean of its divisors is an integer number (3605052866168).

Almost surely, 2^{21630223110261} is an apocalyptic number.

It is an amenable number.

21630223110261 is a deficient number, since it is larger than the sum of its proper divisors (7210199819083).

21630223110261 is a wasteful number, since it uses less digits than its factorization.

21630223110261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31362251.

The product of its (nonzero) digits is 5184, while the sum is 30.

Adding to 21630223110261 its reverse (16201132203612), we get a palindrome (37831355313873).

The spelling of 21630223110261 in words is "twenty-one trillion, six hundred thirty billion, two hundred twenty-three million, one hundred ten thousand, two hundred sixty-one".