2102221210123 has 4 divisors (see below), whose sum is σ = 2103928945888. Its totient is φ = 2100513474360.

The previous prime is 2102221210081. The next prime is 2102221210139. The reversal of 2102221210123 is 3210121222012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2102221210123 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2102221210123.

It is not an unprimeable number, because it can be changed into a prime (2102221240123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 853866036 + ... + 853868497.

It is an arithmetic number, because the mean of its divisors is an integer number (525982236472).

Almost surely, 2^{2102221210123} is an apocalyptic number.

2102221210123 is a deficient number, since it is larger than the sum of its proper divisors (1707735765).

2102221210123 is a wasteful number, since it uses less digits than its factorization.

2102221210123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1707735764.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 2102221210123 its reverse (3210121222012), we get a palindrome (5312342432135).

The spelling of 2102221210123 in words is "two trillion, one hundred two billion, two hundred twenty-one million, two hundred ten thousand, one hundred twenty-three".