21333213221297 has 2 divisors, whose sum is σ = 21333213221298. Its totient is φ = 21333213221296.

The previous prime is 21333213221293. The next prime is 21333213221339. The reversal of 21333213221297 is 79212231233312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21173977107361 + 159236113936 = 4601519^2 + 399044^2 .

It is a cyclic number.

It is not a de Polignac number, because 21333213221297 - 2² = 21333213221293 is a prime.

It is a super-2 number, since 2×21333213221297² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21333213221293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10666606610648 + 10666606610649.

It is an arithmetic number, because the mean of its divisors is an integer number (10666606610649).

Almost surely, 2^{21333213221297} is an apocalyptic number.

It is an amenable number.

21333213221297 is a deficient number, since it is larger than the sum of its proper divisors (1).

21333213221297 is an equidigital number, since it uses as much as digits as its factorization.

21333213221297 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 41.

The spelling of 21333213221297 in words is "twenty-one trillion, three hundred thirty-three billion, two hundred thirteen million, two hundred twenty-one thousand, two hundred ninety-seven".