21212220212202 has 32 divisors (see below), whose sum is σ = 42438512450880. Its totient is φ = 7068394999040.

The previous prime is 21212220212189. The next prime is 21212220212221. The reversal of 21212220212202 is 20221202221212.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 553521202 + ... + 553559522.

It is an arithmetic number, because the mean of its divisors is an integer number (1326203514090).

Almost surely, 2^{21212220212202} is an apocalyptic number.

21212220212202 is an abundant number, since it is smaller than the sum of its proper divisors (21226292238678).

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

21212220212202 is a wasteful number, since it uses less digits than its factorization.

21212220212202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66518.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 21212220212202 its reverse (20221202221212), we get a palindrome (41433422433414).

The spelling of 21212220212202 in words is "twenty-one trillion, two hundred twelve billion, two hundred twenty million, two hundred twelve thousand, two hundred two".