21844300061 has 4 divisors (see below), whose sum is σ = 21844637952. Its totient is φ = 21843962172.

The previous prime is 21844300039. The next prime is 21844300067. The reversal of 21844300061 is 16000344812.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21844300061 - 2²⁶ = 21777191197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21844299997 and 21844300033.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21844300067) 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, 38291 + ... + 212496.

It is an arithmetic number, because the mean of its divisors is an integer number (5461159488).

Almost surely, 2^21844300061 is an apocalyptic number.

It is an amenable number.

21844300061 is a deficient number, since it is larger than the sum of its proper divisors (337891).

21844300061 is an equidigital number, since it uses as much as digits as its factorization.

21844300061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337890.

The product of its (nonzero) digits is 4608, while the sum is 29.

Adding to 21844300061 its reverse (16000344812), we get a palindrome (37844644873).

The spelling of 21844300061 in words is "twenty-one billion, eight hundred forty-four million, three hundred thousand, sixty-one".