21001210202222 has 16 divisors (see below), whose sum is σ = 31725534762000. Its totient is φ = 10426086605760.

The previous prime is 21001210202213. The next prime is 21001210202233. The reversal of 21001210202222 is 22220201210012.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21001210202222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12894479 + ... + 14431562.

It is an arithmetic number, because the mean of its divisors is an integer number (1982845922625).

Almost surely, 2^{21001210202222} is an apocalyptic number.

21001210202222 is a deficient number, since it is larger than the sum of its proper divisors (10724324559778).

21001210202222 is a wasteful number, since it uses less digits than its factorization.

21001210202222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27328771.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21001210202222 its reverse (22220201210012), we get a palindrome (43221411412234).

The spelling of 21001210202222 in words is "twenty-one trillion, one billion, two hundred ten million, two hundred two thousand, two hundred twenty-two".