21223020034 has 4 divisors (see below), whose sum is σ = 31834530054. Its totient is φ = 10611510016.

The previous prime is 21223020001. The next prime is 21223020041. The reversal of 21223020034 is 43002032212.

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

It can be written as a sum of positive squares in only one way, i.e., 21221205625 + 1814409 = 145675^2 + 1347^2 .

It is a super-2 number, since 2×21223020034² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21223019993 and 21223020020.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5305755007 + ... + 5305755010.

Almost surely, 2^21223020034 is an apocalyptic number.

21223020034 is a deficient number, since it is larger than the sum of its proper divisors (10611510020).

21223020034 is a wasteful number, since it uses less digits than its factorization.

21223020034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10611510019.

The product of its (nonzero) digits is 576, while the sum is 19.

Adding to 21223020034 its reverse (43002032212), we get a palindrome (64225052246).

The spelling of 21223020034 in words is "twenty-one billion, two hundred twenty-three million, twenty thousand, thirty-four".