21210121102102 has 8 divisors (see below), whose sum is σ = 31840901286336. Its totient is φ = 10596487339992.

The previous prime is 21210121102069. The next prime is 21210121102103. The reversal of 21210121102102 is 20120112101212.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210121102103) 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, 4286602438 + ... + 4286607385.

It is an arithmetic number, because the mean of its divisors is an integer number (3980112660792).

Almost surely, 2^{21210121102102} is an apocalyptic number.

21210121102102 is a deficient number, since it is larger than the sum of its proper divisors (10630780184234).

21210121102102 is a wasteful number, since it uses less digits than its factorization.

21210121102102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8573211062.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21210121102102 its reverse (20120112101212), we get a palindrome (41330233203314).

The spelling of 21210121102102 in words is "twenty-one trillion, two hundred ten billion, one hundred twenty-one million, one hundred two thousand, one hundred two".