21340240100 has 36 divisors (see below), whose sum is σ = 46319345268. Its totient is φ = 8534064000.

The previous prime is 21340240057. The next prime is 21340240111. The reversal of 21340240100 is 104204312.

It can be written as a sum of positive squares in 6 ways, for example, as 49928356 + 21290311744 = 7066^2 + 145912^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 439010 + ... + 485190.

Almost surely, 2^21340240100 is an apocalyptic number.

21340240100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21340240100 is an abundant number, since it is smaller than the sum of its proper divisors (24979105168).

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

21340240100 is a wasteful number, since it uses less digits than its factorization.

21340240100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50816 (or 50809 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21340240100 its reverse (104204312), we get a palindrome (21444444412).

The spelling of 21340240100 in words is "twenty-one billion, three hundred forty million, two hundred forty thousand, one hundred".