21220320619 has 2 divisors, whose sum is σ = 21220320620. Its totient is φ = 21220320618.

The previous prime is 21220320613. The next prime is 21220320661. The reversal of 21220320619 is 91602302212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21220320619 - 2¹¹ = 21220318571 is a prime.

It is a super-2 number, since 2×21220320619² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21220320613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610160309 + 10610160310.

It is an arithmetic number, because the mean of its divisors is an integer number (10610160310).

Almost surely, 2^21220320619 is an apocalyptic number.

21220320619 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220320619 is an equidigital number, since it uses as much as digits as its factorization.

21220320619 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 28.

The spelling of 21220320619 in words is "twenty-one billion, two hundred twenty million, three hundred twenty thousand, six hundred nineteen".