21220021110212 has 6 divisors (see below), whose sum is σ = 37135036942878. Its totient is φ = 10610010555104.

The previous prime is 21220021110163. The next prime is 21220021110227. The reversal of 21220021110212 is 21201112002212.

It can be written as a sum of positive squares in only one way, i.e., 20655788778496 + 564232331716 = 4544864^2 + 751154^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2652502638773 + ... + 2652502638780.

It is an arithmetic number, because the mean of its divisors is an integer number (6189172823813).

Almost surely, 2^{21220021110212} is an apocalyptic number.

It is an amenable number.

21220021110212 is a deficient number, since it is larger than the sum of its proper divisors (15915015832666).

21220021110212 is a wasteful number, since it uses less digits than its factorization.

21220021110212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5305005277557 (or 5305005277555 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21220021110212 its reverse (21201112002212), we get a palindrome (42421133112424).

The spelling of 21220021110212 in words is "twenty-one trillion, two hundred twenty billion, twenty-one million, one hundred ten thousand, two hundred twelve".