21110221240 has 128 divisors (see below), whose sum is σ = 52530379200. Its totient is φ = 7600988160.

The previous prime is 21110221201. The next prime is 21110221303. The reversal of 21110221240 is 4212201112.

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, 1477330 + ... + 1491550.

Almost surely, 2^21110221240 is an apocalyptic number.

21110221240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21110221240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26265189600).

21110221240 is an abundant number, since it is smaller than the sum of its proper divisors (31420157960).

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

21110221240 is a wasteful number, since it uses less digits than its factorization.

21110221240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14345 (or 14341 counting only the distinct ones).

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

Adding to 21110221240 its reverse (4212201112), we get a palindrome (25322422352).

The spelling of 21110221240 in words is "twenty-one billion, one hundred ten million, two hundred twenty-one thousand, two hundred forty".