21002240140 has 48 divisors (see below), whose sum is σ = 53058297600. Its totient is φ = 6821779392.

The previous prime is 21002240117. The next prime is 21002240153. The reversal of 21002240140 is 4104220012.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3945130 + ... + 3950449.

It is an arithmetic number, because the mean of its divisors is an integer number (1105381200).

Almost surely, 2^21002240140 is an apocalyptic number.

21002240140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21002240140 is an abundant number, since it is smaller than the sum of its proper divisors (32056057460).

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

21002240140 is a wasteful number, since it uses less digits than its factorization.

21002240140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7895614 (or 7895612 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21002240140 its reverse (4104220012), we get a palindrome (25106460152).

The spelling of 21002240140 in words is "twenty-one billion, two million, two hundred forty thousand, one hundred forty".