21002122112212 has 6 divisors (see below), whose sum is σ = 36753713696378. Its totient is φ = 10501061056104.

The previous prime is 21002122112203. The next prime is 21002122112233. The reversal of 21002122112212 is 21221122120012.

It can be written as a sum of positive squares in only one way, i.e., 14330419086916 + 6671703025296 = 3785554^2 + 2582964^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21002122112212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2625265264023 + ... + 2625265264030.

Almost surely, 2^{21002122112212} is an apocalyptic number.

It is an amenable number.

21002122112212 is a deficient number, since it is larger than the sum of its proper divisors (15751591584166).

21002122112212 is a wasteful number, since it uses less digits than its factorization.

21002122112212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5250530528057 (or 5250530528055 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21002122112212 its reverse (21221122120012), we get a palindrome (42223244232224).

The spelling of 21002122112212 in words is "twenty-one trillion, two billion, one hundred twenty-two million, one hundred twelve thousand, two hundred twelve".