21418334740 has 24 divisors (see below), whose sum is σ = 49067458272. Its totient is φ = 7788485280.

The previous prime is 21418334723. The next prime is 21418334741. The reversal of 21418334740 is 4743381412.

It is a self number, because there is not a number n which added to its sum of digits gives 21418334740.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21418334741) 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, 48677814 + ... + 48678253.

It is an arithmetic number, because the mean of its divisors is an integer number (2044477428).

Almost surely, 2^21418334740 is an apocalyptic number.

21418334740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21418334740 is an abundant number, since it is smaller than the sum of its proper divisors (27649123532).

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

21418334740 is a wasteful number, since it uses less digits than its factorization.

21418334740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97356087 (or 97356085 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 37.

The spelling of 21418334740 in words is "twenty-one billion, four hundred eighteen million, three hundred thirty-four thousand, seven hundred forty".