21100243210340 has 72 divisors (see below), whose sum is σ = 52447025746752. Its totient is φ = 6984908058240.

The previous prime is 21100243210283. The next prime is 21100243210379. The reversal of 21100243210340 is 4301234200112.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 89487506 + ... + 89722985.

Almost surely, 2^{21100243210340} is an apocalyptic number.

21100243210340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21100243210340 is an abundant number, since it is smaller than the sum of its proper divisors (31346782536412).

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

21100243210340 is a wasteful number, since it uses less digits than its factorization.

21100243210340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179210565 (or 179210534 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21100243210340 its reverse (4301234200112), we get a palindrome (25401477410452).

The spelling of 21100243210340 in words is "twenty-one trillion, one hundred billion, two hundred forty-three million, two hundred ten thousand, three hundred forty".