21222402379 has 2 divisors, whose sum is σ = 21222402380. Its totient is φ = 21222402378.

The previous prime is 21222402373. The next prime is 21222402389. The reversal of 21222402379 is 97320422212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21222402379 - 2³ = 21222402371 is a prime.

It is not a weakly prime, because it can be changed into another prime (21222402371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611201189 + 10611201190.

It is an arithmetic number, because the mean of its divisors is an integer number (10611201190).

Almost surely, 2^21222402379 is an apocalyptic number.

21222402379 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222402379 is an equidigital number, since it uses as much as digits as its factorization.

21222402379 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 34.

The spelling of 21222402379 in words is "twenty-one billion, two hundred twenty-two million, four hundred two thousand, three hundred seventy-nine".