210640132920 has 128 divisors (see below), whose sum is σ = 722536381440. Its totient is φ = 48123540480.

The previous prime is 210640132919. The next prime is 210640132921. The reversal of 210640132920 is 29231046012.

It is an interprime number because it is at equal distance from previous prime (210640132919) and next prime (210640132921).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210640132921) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1750285 + ... + 1866755.

It is an arithmetic number, because the mean of its divisors is an integer number (5644815480).

Almost surely, 2^210640132920 is an apocalyptic number.

210640132920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 210640132920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (361268190720).

210640132920 is an abundant number, since it is smaller than the sum of its proper divisors (511896248520).

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

210640132920 is a wasteful number, since it uses less digits than its factorization.

210640132920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118645 (or 118641 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

Adding to 210640132920 its reverse (29231046012), we get a palindrome (239871178932).

The spelling of 210640132920 in words is "two hundred ten billion, six hundred forty million, one hundred thirty-two thousand, nine hundred twenty".