21020222212 has 24 divisors (see below), whose sum is σ = 40526845632. Its totient is φ = 9460044000.

The previous prime is 21020222183. The next prime is 21020222213. The reversal of 21020222212 is 21222202012.

It is a super-3 number, since 3×21020222212³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21020222213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2360568 + ... + 2369455.

It is an arithmetic number, because the mean of its divisors is an integer number (1688618568).

Almost surely, 2^21020222212 is an apocalyptic number.

21020222212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21020222212 is a deficient number, since it is larger than the sum of its proper divisors (19506623420).

21020222212 is a wasteful number, since it uses less digits than its factorization.

21020222212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4730139 (or 4730137 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21020222212 its reverse (21222202012), we get a palindrome (42242424224).

The spelling of 21020222212 in words is "twenty-one billion, twenty million, two hundred twenty-two thousand, two hundred twelve".