21102121102 has 8 divisors (see below), whose sum is σ = 31813858296. Its totient is φ = 10497501672.

The previous prime is 21102121093. The next prime is 21102121123. The reversal of 21102121102 is 20112120112.

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

It is a congruent number.

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, 26778948 + ... + 26779735.

It is an arithmetic number, because the mean of its divisors is an integer number (3976732287).

Almost surely, 2^21102121102 is an apocalyptic number.

21102121102 is a deficient number, since it is larger than the sum of its proper divisors (10711737194).

21102121102 is a wasteful number, since it uses less digits than its factorization.

21102121102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53558882.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21102121102 its reverse (20112120112), we get a palindrome (41214241214).

It can be divided in two parts, 2110 and 2121102, that added together give a palindrome (2123212).

The spelling of 21102121102 in words is "twenty-one billion, one hundred two million, one hundred twenty-one thousand, one hundred two".