21021102219 has 16 divisors (see below), whose sum is σ = 31772787200. Its totient is φ = 12255217056.

The previous prime is 21021102209. The next prime is 21021102283. The reversal of 21021102219 is 91220112012.

It is not a de Polignac number, because 21021102219 - 2¹⁹ = 21020577931 is a prime.

It is a super-2 number, since 2×21021102219² (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 = 21021102195 and 21021102204.

It is not an unprimeable number, because it can be changed into a prime (21021102209) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14183539 + ... + 14185020.

It is an arithmetic number, because the mean of its divisors is an integer number (1985799200).

Almost surely, 2^21021102219 is an apocalyptic number.

21021102219 is a deficient number, since it is larger than the sum of its proper divisors (10751684981).

21021102219 is a wasteful number, since it uses less digits than its factorization.

21021102219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28368594.

The product of its (nonzero) digits is 144, while the sum is 21.

The spelling of 21021102219 in words is "twenty-one billion, twenty-one million, one hundred two thousand, two hundred nineteen".