21841450837 has 4 divisors (see below), whose sum is σ = 21912595936. Its totient is φ = 21770305740.

The previous prime is 21841450789. The next prime is 21841450843. The reversal of 21841450837 is 73805414812.

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 21841450837 - 2¹¹ = 21841448789 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21841450793 and 21841450802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21841450867) 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, 35572089 + ... + 35572702.

It is an arithmetic number, because the mean of its divisors is an integer number (5478148984).

Almost surely, 2^21841450837 is an apocalyptic number.

It is an amenable number.

21841450837 is a deficient number, since it is larger than the sum of its proper divisors (71145099).

21841450837 is an equidigital number, since it uses as much as digits as its factorization.

21841450837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71145098.

The product of its (nonzero) digits is 215040, while the sum is 43.

The spelling of 21841450837 in words is "twenty-one billion, eight hundred forty-one million, four hundred fifty thousand, eight hundred thirty-seven".