21312223320837 has 16 divisors (see below), whose sum is σ = 28809681030080. Its totient is φ = 14011512907392.

The previous prime is 21312223320809. The next prime is 21312223320881. The reversal of 21312223320837 is 73802332221312.

It is not a de Polignac number, because 21312223320837 - 2¹⁰ = 21312223319813 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21312223320795 and 21312223320804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21312223820837) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5421787 + ... + 8486472.

It is an arithmetic number, because the mean of its divisors is an integer number (1800605064380).

Almost surely, 2^{21312223320837} is an apocalyptic number.

It is an amenable number.

21312223320837 is a deficient number, since it is larger than the sum of its proper divisors (7497457709243).

21312223320837 is a wasteful number, since it uses less digits than its factorization.

21312223320837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13915332.

The product of its (nonzero) digits is 145152, while the sum is 39.

The spelling of 21312223320837 in words is "twenty-one trillion, three hundred twelve billion, two hundred twenty-three million, three hundred twenty thousand, eight hundred thirty-seven".