21115230340 has 48 divisors (see below), whose sum is σ = 46053100800. Its totient is φ = 8126258432.

The previous prime is 21115230313. The next prime is 21115230349. The reversal of 21115230340 is 4303251112.

It is a happy number.

It is a super-2 number, since 2×21115230340² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21115230349) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134905 + ... + 245824.

It is an arithmetic number, because the mean of its divisors is an integer number (959439600).

Almost surely, 2^21115230340 is an apocalyptic number.

21115230340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21115230340 is an abundant number, since it is smaller than the sum of its proper divisors (24937870460).

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

21115230340 is a wasteful number, since it uses less digits than its factorization.

21115230340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380844 (or 380842 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 21115230340 its reverse (4303251112), we get a palindrome (25418481452).

The spelling of 21115230340 in words is "twenty-one billion, one hundred fifteen million, two hundred thirty thousand, three hundred forty".