21100421140 has 12 divisors (see below), whose sum is σ = 44310884436. Its totient is φ = 8440168448.

The previous prime is 21100421093. The next prime is 21100421171. The reversal of 21100421140 is 4112400112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 12893148304 + 8207272836 = 113548^2 + 90594^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 527510509 + ... + 527510548.

It is an arithmetic number, because the mean of its divisors is an integer number (3692573703).

Almost surely, 2^21100421140 is an apocalyptic number.

21100421140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21100421140 is an abundant number, since it is smaller than the sum of its proper divisors (23210463296).

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

21100421140 is a wasteful number, since it uses less digits than its factorization.

21100421140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1055021066 (or 1055021064 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21100421140 its reverse (4112400112), we get a palindrome (25212821252).

The spelling of 21100421140 in words is "twenty-one billion, one hundred million, four hundred twenty-one thousand, one hundred forty".