21200311240 has 32 divisors (see below), whose sum is σ = 47736766080. Its totient is φ = 8473712832.

The previous prime is 21200311229. The next prime is 21200311241. The reversal of 21200311240 is 4211300212.

It is a super-3 number, since 3×21200311240³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21200311241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 146622 + ... + 252781.

It is an arithmetic number, because the mean of its divisors is an integer number (1491773940).

Almost surely, 2^21200311240 is an apocalyptic number.

21200311240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21200311240 is an abundant number, since it is smaller than the sum of its proper divisors (26536454840).

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

21200311240 is a wasteful number, since it uses less digits than its factorization.

21200311240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400741 (or 400737 counting only the distinct ones).

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

Adding to 21200311240 its reverse (4211300212), we get a palindrome (25411611452).

The spelling of 21200311240 in words is "twenty-one billion, two hundred million, three hundred eleven thousand, two hundred forty".