21113052240 has 80 divisors (see below), whose sum is σ = 74800533888. Its totient is φ = 4825840128.

The previous prime is 21113052179. The next prime is 21113052241. The reversal of 21113052240 is 4225031112.

It is a tau number, because it is divible by the number of its divisors (80).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113052241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6281967 + ... + 6285326.

Almost surely, 2^21113052240 is an apocalyptic number.

21113052240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21113052240 is an abundant number, since it is smaller than the sum of its proper divisors (53687481648).

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

21113052240 is a wasteful number, since it uses less digits than its factorization.

21113052240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12567316 (or 12567310 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 21113052240 its reverse (4225031112), we get a palindrome (25338083352).

The spelling of 21113052240 in words is "twenty-one billion, one hundred thirteen million, fifty-two thousand, two hundred forty".