21301201240 has 32 divisors (see below), whose sum is σ = 52284767760. Its totient is φ = 7745891200.

The previous prime is 21301201211. The next prime is 21301201241. The reversal of 21301201240 is 4210210312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21301201241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24205471 + ... + 24206350.

Almost surely, 2^21301201240 is an apocalyptic number.

21301201240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21301201240 is an abundant number, since it is smaller than the sum of its proper divisors (30983566520).

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

21301201240 is a wasteful number, since it uses less digits than its factorization.

21301201240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48411843 (or 48411839 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21301201240 its reverse (4210210312), we get a palindrome (25511411552).

The spelling of 21301201240 in words is "twenty-one billion, three hundred one million, two hundred one thousand, two hundred forty".