21221020022 has 8 divisors (see below), whose sum is σ = 31850630136. Its totient is φ = 10604143312.

The previous prime is 21221020021. The next prime is 21221020039. The reversal of 21221020022 is 22002012212.

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

It is a junction number, because it is equal to n+sod(n) for n = 21221019979 and 21221020006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221020021) 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, 3179183 + ... + 3185850.

It is an arithmetic number, because the mean of its divisors is an integer number (3981328767).

Almost surely, 2^21221020022 is an apocalyptic number.

21221020022 is a deficient number, since it is larger than the sum of its proper divisors (10629610114).

21221020022 is a wasteful number, since it uses less digits than its factorization.

21221020022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6366702.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21221020022 its reverse (22002012212), we get a palindrome (43223032234).

It can be divided in two parts, 212210 and 20022, that added together give a palindrome (232232).

The spelling of 21221020022 in words is "twenty-one billion, two hundred twenty-one million, twenty thousand, twenty-two".