21122312249 has 2 divisors, whose sum is σ = 21122312250. Its totient is φ = 21122312248.

The previous prime is 21122312173. The next prime is 21122312261. The reversal of 21122312249 is 94221322112.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16068097600 + 5054214649 = 126760^2 + 71093^2 .

It is a cyclic number.

It is not a de Polignac number, because 21122312249 - 2¹⁶ = 21122246713 is a prime.

It is not a weakly prime, because it can be changed into another prime (21122212249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561156124 + 10561156125.

It is an arithmetic number, because the mean of its divisors is an integer number (10561156125).

Almost surely, 2^21122312249 is an apocalyptic number.

It is an amenable number.

21122312249 is a deficient number, since it is larger than the sum of its proper divisors (1).

21122312249 is an equidigital number, since it uses as much as digits as its factorization.

21122312249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 29.

The spelling of 21122312249 in words is "twenty-one billion, one hundred twenty-two million, three hundred twelve thousand, two hundred forty-nine".