21337498396321 has 2 divisors, whose sum is σ = 21337498396322. Its totient is φ = 21337498396320.

The previous prime is 21337498396309. The next prime is 21337498396327. The reversal of 21337498396321 is 12369389473312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21190472162721 + 147026233600 = 4603311^2 + 383440^2 .

It is a cyclic number.

It is not a de Polignac number, because 21337498396321 - 2¹⁷ = 21337498265249 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21337498396321.

It is not a weakly prime, because it can be changed into another prime (21337498396327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10668749198160 + 10668749198161.

It is an arithmetic number, because the mean of its divisors is an integer number (10668749198161).

Almost surely, 2^{21337498396321} is an apocalyptic number.

It is an amenable number.

21337498396321 is a deficient number, since it is larger than the sum of its proper divisors (1).

21337498396321 is an equidigital number, since it uses as much as digits as its factorization.

21337498396321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35271936, while the sum is 61.

The spelling of 21337498396321 in words is "twenty-one trillion, three hundred thirty-seven billion, four hundred ninety-eight million, three hundred ninety-six thousand, three hundred twenty-one".