21312222032237 has 2 divisors, whose sum is σ = 21312222032238. Its totient is φ = 21312222032236.

The previous prime is 21312222032209. The next prime is 21312222032291. The reversal of 21312222032237 is 73223022221312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18823545409321 + 2488676622916 = 4338611^2 + 1577554^2 .

It is a cyclic number.

It is not a de Polignac number, because 21312222032237 - 2¹⁶ = 21312221966701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21312222032837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10656111016118 + 10656111016119.

It is an arithmetic number, because the mean of its divisors is an integer number (10656111016119).

Almost surely, 2^{21312222032237} is an apocalyptic number.

It is an amenable number.

21312222032237 is a deficient number, since it is larger than the sum of its proper divisors (1).

21312222032237 is an equidigital number, since it uses as much as digits as its factorization.

21312222032237 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 32.

Adding to 21312222032237 its reverse (73223022221312), we get a palindrome (94535244253549).

The spelling of 21312222032237 in words is "twenty-one trillion, three hundred twelve billion, two hundred twenty-two million, thirty-two thousand, two hundred thirty-seven".