21102121010102 has 8 divisors (see below), whose sum is σ = 34530743471112. Its totient is φ = 9591873186400.

The previous prime is 21102121010099. The next prime is 21102121010107. The reversal of 21102121010102 is 20101012120112.

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

It is a super-2 number, since 2×21102121010102² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102121010107) 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, 479593659299 + ... + 479593659342.

It is an arithmetic number, because the mean of its divisors is an integer number (4316342933889).

Almost surely, 2^{21102121010102} is an apocalyptic number.

21102121010102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21102121010102 is a deficient number, since it is larger than the sum of its proper divisors (13428622461010).

21102121010102 is a wasteful number, since it uses less digits than its factorization.

21102121010102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 959187318654.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21102121010102 its reverse (20101012120112), we get a palindrome (41203133130214).

The spelling of 21102121010102 in words is "twenty-one trillion, one hundred two billion, one hundred twenty-one million, ten thousand, one hundred two".