21110202102 has 128 divisors (see below), whose sum is σ = 48901874688. Its totient is φ = 6012864000.

The previous prime is 21110202101. The next prime is 21110202109. The reversal of 21110202102 is 20120201112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110202101) 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, 24070488 + ... + 24071364.

It is an arithmetic number, because the mean of its divisors is an integer number (382045896).

Almost surely, 2^21110202102 is an apocalyptic number.

21110202102 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 21110202102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24450937344).

21110202102 is an abundant number, since it is smaller than the sum of its proper divisors (27791672586).

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

21110202102 is a wasteful number, since it uses less digits than its factorization.

21110202102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1174.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21110202102 its reverse (20120201112), we get a palindrome (41230403214).

The spelling of 21110202102 in words is "twenty-one billion, one hundred ten million, two hundred two thousand, one hundred two".