21222212121002 has 8 divisors (see below), whose sum is σ = 31833539431812. Its totient is φ = 10611032310400.

The previous prime is 21222212120983. The next prime is 21222212121013. The reversal of 21222212121002 is 20012121222212.

It can be written as a sum of positive squares in 2 ways, for example, as 18796222082521 + 2425990038481 = 4335461^2 + 1557559^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36514649 + ... + 37091292.

Almost surely, 2^{21222212121002} is an apocalyptic number.

21222212121002 is a deficient number, since it is larger than the sum of its proper divisors (10611327310810).

21222212121002 is a wasteful number, since it uses less digits than its factorization.

21222212121002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73750104.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21222212121002 its reverse (20012121222212), we get a palindrome (41234333343214).

The spelling of 21222212121002 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred twelve million, one hundred twenty-one thousand, two".