21140232102 has 72 divisors (see below), whose sum is σ = 51172037280. Its totient is φ = 6301072800.

The previous prime is 21140232023. The next prime is 21140232107. The reversal of 21140232102 is 20123204112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21140232107) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 53299 + ... + 212417.

It is an arithmetic number, because the mean of its divisors is an integer number (710722740).

Almost surely, 2^21140232102 is an apocalyptic number.

21140232102 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 21140232102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25586018640).

21140232102 is an abundant number, since it is smaller than the sum of its proper divisors (30031805178).

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

21140232102 is a wasteful number, since it uses less digits than its factorization.

21140232102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159210 (or 159196 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21140232102 its reverse (20123204112), we get a palindrome (41263436214).

The spelling of 21140232102 in words is "twenty-one billion, one hundred forty million, two hundred thirty-two thousand, one hundred two".