26465313221 has 2 divisors, whose sum is σ = 26465313222. Its totient is φ = 26465313220.

The previous prime is 26465313181. The next prime is 26465313283. The reversal of 26465313221 is 12231356462.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18893877025 + 7571436196 = 137455^2 + 87014^2 .

It is a cyclic number.

It is not a de Polignac number, because 26465313221 - 2²² = 26461118917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26465613221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13232656610 + 13232656611.

It is an arithmetic number, because the mean of its divisors is an integer number (13232656611).

Almost surely, 2^26465313221 is an apocalyptic number.

It is an amenable number.

26465313221 is a deficient number, since it is larger than the sum of its proper divisors (1).

26465313221 is an equidigital number, since it uses as much as digits as its factorization.

26465313221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 35.

Adding to 26465313221 its reverse (12231356462), we get a palindrome (38696669683).

The spelling of 26465313221 in words is "twenty-six billion, four hundred sixty-five million, three hundred thirteen thousand, two hundred twenty-one".