22021121011261 has 2 divisors, whose sum is σ = 22021121011262. Its totient is φ = 22021121011260.

The previous prime is 22021121011259. The next prime is 22021121011271. The reversal of 22021121011261 is 16211012112022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15568982520025 + 6452138491236 = 3945755^2 + 2540106^2 .

It is a cyclic number.

It is not a de Polignac number, because 22021121011261 - 2¹ = 22021121011259 is a prime.

Together with 22021121011259, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22021121011271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11010560505630 + 11010560505631.

It is an arithmetic number, because the mean of its divisors is an integer number (11010560505631).

Almost surely, 2^{22021121011261} is an apocalyptic number.

It is an amenable number.

22021121011261 is a deficient number, since it is larger than the sum of its proper divisors (1).

22021121011261 is an equidigital number, since it uses as much as digits as its factorization.

22021121011261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 22.

Adding to 22021121011261 its reverse (16211012112022), we get a palindrome (38232133123283).

The spelling of 22021121011261 in words is "twenty-two trillion, twenty-one billion, one hundred twenty-one million, eleven thousand, two hundred sixty-one".