21202121219 has 4 divisors (see below), whose sum is σ = 21602161296. Its totient is φ = 20802081144.

The previous prime is 21202121207. The next prime is 21202121221. The reversal of 21202121219 is 91212120212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21202121219 - 2²⁴ = 21185344003 is a prime.

It is a super-2 number, since 2×21202121219² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21202121194 and 21202121203.

It is not an unprimeable number, because it can be changed into a prime (21202121419) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200019959 + ... + 200020064.

It is an arithmetic number, because the mean of its divisors is an integer number (5400540324).

Almost surely, 2^21202121219 is an apocalyptic number.

21202121219 is a deficient number, since it is larger than the sum of its proper divisors (400040077).

21202121219 is an equidigital number, since it uses as much as digits as its factorization.

21202121219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400040076.

The product of its (nonzero) digits is 288, while the sum is 23.

The spelling of 21202121219 in words is "twenty-one billion, two hundred two million, one hundred twenty-one thousand, two hundred nineteen".