21020022002212 has 12 divisors (see below), whose sum is σ = 36785224992796. Its totient is φ = 10509957718560.

The previous prime is 21020022002149. The next prime is 21020022002219. The reversal of 21020022002212 is 21220022002012.

It can be written as a sum of positive squares in 2 ways, for example, as 17758942226496 + 3261079775716 = 4214136^2 + 1805846^2 .

It is not an unprimeable number, because it can be changed into a prime (21020022002219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12426339 + ... + 14016202.

Almost surely, 2^{21020022002212} is an apocalyptic number.

It is an amenable number.

21020022002212 is a deficient number, since it is larger than the sum of its proper divisors (15765202990584).

21020022002212 is a wasteful number, since it uses less digits than its factorization.

21020022002212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26641278 (or 26641276 counting only the distinct ones).

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

Adding to 21020022002212 its reverse (21220022002012), we get a palindrome (42240044004224).

The spelling of 21020022002212 in words is "twenty-one trillion, twenty billion, twenty-two million, two thousand, two hundred twelve".