21221122019 has 4 divisors (see below), whose sum is σ = 21431232240. Its totient is φ = 21011011800.

The previous prime is 21221121991. The next prime is 21221122061. The reversal of 21221122019 is 91022112212.

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 21221122019 - 2²⁰ = 21220073443 is a prime.

It is a super-2 number, since 2×21221122019² (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 = 21221121985 and 21221122003.

It is not an unprimeable number, because it can be changed into a prime (21221122519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105054959 + ... + 105055160.

It is an arithmetic number, because the mean of its divisors is an integer number (5357808060).

Almost surely, 2^21221122019 is an apocalyptic number.

21221122019 is a deficient number, since it is larger than the sum of its proper divisors (210110221).

21221122019 is a wasteful number, since it uses less digits than its factorization.

21221122019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210110220.

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

The spelling of 21221122019 in words is "twenty-one billion, two hundred twenty-one million, one hundred twenty-two thousand, nineteen".