21001012102222 has 4 divisors (see below), whose sum is σ = 31501518153336. Its totient is φ = 10500506051110.

The previous prime is 21001012102201. The next prime is 21001012102253. The reversal of 21001012102222 is 22220121010012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 21001012102196 and 21001012102205.

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, 5250253025554 + ... + 5250253025557.

It is an arithmetic number, because the mean of its divisors is an integer number (7875379538334).

Almost surely, 2^{21001012102222} is an apocalyptic number.

21001012102222 is a deficient number, since it is larger than the sum of its proper divisors (10500506051114).

21001012102222 is a wasteful number, since it uses less digits than its factorization.

21001012102222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10500506051113.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21001012102222 its reverse (22220121010012), we get a palindrome (43221133112234).

The spelling of 21001012102222 in words is "twenty-one trillion, one billion, twelve million, one hundred two thousand, two hundred twenty-two".