22021423021 has 8 divisors (see below), whose sum is σ = 23758741664. Its totient is φ = 20290299120.

The previous prime is 22021423009. The next prime is 22021423043. The reversal of 22021423021 is 12032412022.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 22021423021 - 2⁵ = 22021422989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22021423021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22021423051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1541295 + ... + 1555516.

It is an arithmetic number, because the mean of its divisors is an integer number (2969842708).

Almost surely, 2^22021423021 is an apocalyptic number.

It is an amenable number.

22021423021 is a deficient number, since it is larger than the sum of its proper divisors (1737318643).

22021423021 is a wasteful number, since it uses less digits than its factorization.

22021423021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3097371.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 22021423021 its reverse (12032412022), we get a palindrome (34053835043).

The spelling of 22021423021 in words is "twenty-two billion, twenty-one million, four hundred twenty-three thousand, twenty-one".