21010020222 has 24 divisors (see below), whose sum is σ = 44348025096. Its totient is φ = 6634742544.

The previous prime is 21010020179. The next prime is 21010020223. The reversal of 21010020222 is 22202001012.

It is a junction number, because it is equal to n+sod(n) for n = 21010020198 and 21010020207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010020223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4847793 + ... + 4852124.

It is an arithmetic number, because the mean of its divisors is an integer number (1847834379).

Almost surely, 2^21010020222 is an apocalyptic number.

21010020222 is an abundant number, since it is smaller than the sum of its proper divisors (23338004874).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21010020222 is a wasteful number, since it uses less digits than its factorization.

21010020222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9699960 (or 9699941 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 21010020222 its reverse (22202001012), we get a palindrome (43212021234).

The spelling of 21010020222 in words is "twenty-one billion, ten million, twenty thousand, two hundred twenty-two".