21250614379 has 2 divisors, whose sum is σ = 21250614380. Its totient is φ = 21250614378.

The previous prime is 21250614367. The next prime is 21250614389. The reversal of 21250614379 is 97341605212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21250614379 - 2¹⁷ = 21250483307 is a prime.

It is a super-2 number, since 2×21250614379² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21250614389) 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, 10625307189 + 10625307190.

It is an arithmetic number, because the mean of its divisors is an integer number (10625307190).

Almost surely, 2^21250614379 is an apocalyptic number.

21250614379 is a deficient number, since it is larger than the sum of its proper divisors (1).

21250614379 is an equidigital number, since it uses as much as digits as its factorization.

21250614379 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 40.

The spelling of 21250614379 in words is "twenty-one billion, two hundred fifty million, six hundred fourteen thousand, three hundred seventy-nine".