21101302241 has 4 divisors (see below), whose sum is σ = 22342555332. Its totient is φ = 19860049152.

The previous prime is 21101302223. The next prime is 21101302247. The reversal of 21101302241 is 14220310112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16847001616 + 4254300625 = 129796^2 + 65225^2 .

It is a cyclic number.

It is not a de Polignac number, because 21101302241 - 2²² = 21097107937 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 1241253073 = 21101302241 / (2 + 1 + 1 + 0 + 1 + 3 + 0 + 2 + 2 + 4 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21101302247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 620626520 + ... + 620626553.

It is an arithmetic number, because the mean of its divisors is an integer number (5585638833).

Almost surely, 2^21101302241 is an apocalyptic number.

It is an amenable number.

21101302241 is a deficient number, since it is larger than the sum of its proper divisors (1241253091).

21101302241 is a wasteful number, since it uses less digits than its factorization.

21101302241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1241253090.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21101302241 its reverse (14220310112), we get a palindrome (35321612353).

The spelling of 21101302241 in words is "twenty-one billion, one hundred one million, three hundred two thousand, two hundred forty-one".