21223212019 has 4 divisors (see below), whose sum is σ = 21226748760. Its totient is φ = 21219675280.

The previous prime is 21223212011. The next prime is 21223212037. The reversal of 21223212019 is 91021232212.

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 21223212019 - 2³ = 21223212011 is a prime.

It is a super-2 number, since 2×21223212019² (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 = 21223211984 and 21223212002.

It is not an unprimeable number, because it can be changed into a prime (21223212011) 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, 1759354 + ... + 1771375.

It is an arithmetic number, because the mean of its divisors is an integer number (5306687190).

Almost surely, 2^21223212019 is an apocalyptic number.

21223212019 is a deficient number, since it is larger than the sum of its proper divisors (3536741).

21223212019 is an equidigital number, since it uses as much as digits as its factorization.

21223212019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3536740.

The product of its (nonzero) digits is 864, while the sum is 25.

The spelling of 21223212019 in words is "twenty-one billion, two hundred twenty-three million, two hundred twelve thousand, nineteen".