21002110011102 has 128 divisors (see below), whose sum is σ = 49478189506560. Its totient is φ = 5875951213440.

The previous prime is 21002110011101. The next prime is 21002110011137. The reversal of 21002110011102 is 20111001120012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002110011101) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 156078783 + ... + 156213285.

It is an arithmetic number, because the mean of its divisors is an integer number (386548355520).

Almost surely, 2^{21002110011102} is an apocalyptic number.

21002110011102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21002110011102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24739094753280).

21002110011102 is an abundant number, since it is smaller than the sum of its proper divisors (28476079495458).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21002110011102 is a wasteful number, since it uses less digits than its factorization.

21002110011102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138118.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21002110011102 its reverse (20111001120012), we get a palindrome (41113111131114).

The spelling of 21002110011102 in words is "twenty-one trillion, two billion, one hundred ten million, eleven thousand, one hundred two".