21102101222 has 4 divisors (see below), whose sum is σ = 31653151836. Its totient is φ = 10551050610.

The previous prime is 21102101201. The next prime is 21102101269. The reversal of 21102101222 is 22210120112.

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 = 21102101197 and 21102101206.

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, 5275525304 + ... + 5275525307.

It is an arithmetic number, because the mean of its divisors is an integer number (7913287959).

Almost surely, 2^21102101222 is an apocalyptic number.

21102101222 is a deficient number, since it is larger than the sum of its proper divisors (10551050614).

21102101222 is a wasteful number, since it uses less digits than its factorization.

21102101222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10551050613.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21102101222 its reverse (22210120112), we get a palindrome (43312221334).

The spelling of 21102101222 in words is "twenty-one billion, one hundred two million, one hundred one thousand, two hundred twenty-two".