21650123050361 has 8 divisors (see below), whose sum is σ = 23316322936200. Its totient is φ = 19984038279552.

The previous prime is 21650123050333. The next prime is 21650123050403. The reversal of 21650123050361 is 16305032105612.

It can be written as a sum of positive squares in 4 ways, for example, as 2878007067961 + 18772115982400 = 1696469^2 + 4332680^2 .

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-21650123050361 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21650123056361) 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, 28387940 + ... + 29140613.

It is an arithmetic number, because the mean of its divisors is an integer number (2914540367025).

Almost surely, 2^{21650123050361} is an apocalyptic number.

It is an amenable number.

21650123050361 is a deficient number, since it is larger than the sum of its proper divisors (1666199885839).

21650123050361 is a wasteful number, since it uses less digits than its factorization.

21650123050361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57557515.

The product of its (nonzero) digits is 32400, while the sum is 35.

Adding to 21650123050361 its reverse (16305032105612), we get a palindrome (37955155155973).

The spelling of 21650123050361 in words is "twenty-one trillion, six hundred fifty billion, one hundred twenty-three million, fifty thousand, three hundred sixty-one".