21202201240 has 64 divisors (see below), whose sum is σ = 52064480160. Its totient is φ = 7706526720.

The previous prime is 21202201201. The next prime is 21202201247. The reversal of 21202201240 is 4210220212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202201247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1142274 + ... + 1160686.

Almost surely, 2^21202201240 is an apocalyptic number.

21202201240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21202201240 is an abundant number, since it is smaller than the sum of its proper divisors (30862278920).

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

21202201240 is a wasteful number, since it uses less digits than its factorization.

21202201240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21052 (or 21048 counting only the distinct ones).

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

Adding to 21202201240 its reverse (4210220212), we get a palindrome (25412421452).

The spelling of 21202201240 in words is "twenty-one billion, two hundred two million, two hundred one thousand, two hundred forty".