21372656219 has 2 divisors, whose sum is σ = 21372656220. Its totient is φ = 21372656218.

The previous prime is 21372656203. The next prime is 21372656233. The reversal of 21372656219 is 91265627312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21372656219 - 2⁴ = 21372656203 is a prime.

It is a super-2 number, since 2×21372656219² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21372656219.

It is not a weakly prime, because it can be changed into another prime (21372656269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10686328109 + 10686328110.

It is an arithmetic number, because the mean of its divisors is an integer number (10686328110).

Almost surely, 2^21372656219 is an apocalyptic number.

21372656219 is a deficient number, since it is larger than the sum of its proper divisors (1).

21372656219 is an equidigital number, since it uses as much as digits as its factorization.

21372656219 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 44.

The spelling of 21372656219 in words is "twenty-one billion, three hundred seventy-two million, six hundred fifty-six thousand, two hundred nineteen".