21301440740 has 24 divisors (see below), whose sum is σ = 47087396160. Its totient is φ = 8072124768.

The previous prime is 21301440739. The next prime is 21301440757. The reversal of 21301440740 is 4704410312.

It is an unprimeable number.

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, 28027832 + ... + 28028591.

It is an arithmetic number, because the mean of its divisors is an integer number (1961974840).

Almost surely, 2^21301440740 is an apocalyptic number.

21301440740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21301440740 is an abundant number, since it is smaller than the sum of its proper divisors (25785955420).

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

21301440740 is a wasteful number, since it uses less digits than its factorization.

21301440740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56056451 (or 56056449 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 26.

The spelling of 21301440740 in words is "twenty-one billion, three hundred one million, four hundred forty thousand, seven hundred forty".