21241213140 has 96 divisors (see below), whose sum is σ = 68328013824. Its totient is φ = 4829696640.

The previous prime is 21241213121. The next prime is 21241213151. The reversal of 21241213140 is 4131214212.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52174 + ... + 212613.

It is an arithmetic number, because the mean of its divisors is an integer number (711750144).

Almost surely, 2^21241213140 is an apocalyptic number.

21241213140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21241213140 is an abundant number, since it is smaller than the sum of its proper divisors (47086800684).

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

21241213140 is a wasteful number, since it uses less digits than its factorization.

21241213140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264997 (or 264995 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 21241213140 its reverse (4131214212), we get a palindrome (25372427352).

The spelling of 21241213140 in words is "twenty-one billion, two hundred forty-one million, two hundred thirteen thousand, one hundred forty".