21010020022 has 8 divisors (see below), whose sum is σ = 31520129256. Its totient is φ = 10503310272.

The previous prime is 21010020007. The next prime is 21010020047. The reversal of 21010020022 is 22002001012.

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 = 21010019990 and 21010020008.

It is a congruent number.

It is an unprimeable number.

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, 834363 + ... + 859174.

It is an arithmetic number, because the mean of its divisors is an integer number (3940016157).

Almost surely, 2^21010020022 is an apocalyptic number.

21010020022 is a deficient number, since it is larger than the sum of its proper divisors (10510109234).

21010020022 is a wasteful number, since it uses less digits than its factorization.

21010020022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1699742.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 21010020022 its reverse (22002001012), we get a palindrome (43012021034).

The spelling of 21010020022 in words is "twenty-one billion, ten million, twenty thousand, twenty-two".