21112405700 has 36 divisors (see below), whose sum is σ = 45920310912. Its totient is φ = 8425351200.

The previous prime is 21112405669. The next prime is 21112405747. The reversal of 21112405700 is 750421112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 201824 + ... + 288023.

It is an arithmetic number, because the mean of its divisors is an integer number (1275564192).

Almost surely, 2^21112405700 is an apocalyptic number.

21112405700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21112405700 is an abundant number, since it is smaller than the sum of its proper divisors (24807905212).

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

21112405700 is a wasteful number, since it uses less digits than its factorization.

21112405700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490292 (or 490285 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 23.

Adding to 21112405700 its reverse (750421112), we get a palindrome (21862826812).

The spelling of 21112405700 in words is "twenty-one billion, one hundred twelve million, four hundred five thousand, seven hundred".