21115341100 has 72 divisors (see below), whose sum is σ = 52997107968. Its totient is φ = 7152302400.

The previous prime is 21115341097. The next prime is 21115341103. The reversal of 21115341100 is 114351112.

It is an interprime number because it is at equal distance from previous prime (21115341097) and next prime (21115341103).

It is not an unprimeable number, because it can be changed into a prime (21115341103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 123616 + ... + 239815.

It is an arithmetic number, because the mean of its divisors is an integer number (736070944).

Almost surely, 2^21115341100 is an apocalyptic number.

21115341100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21115341100 is an abundant number, since it is smaller than the sum of its proper divisors (31881766868).

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

21115341100 is a wasteful number, since it uses less digits than its factorization.

21115341100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363535 (or 363528 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 19.

Adding to 21115341100 its reverse (114351112), we get a palindrome (21229692212).

The spelling of 21115341100 in words is "twenty-one billion, one hundred fifteen million, three hundred forty-one thousand, one hundred".