21434770540 has 12 divisors (see below), whose sum is σ = 45013018176. Its totient is φ = 8573908208.

The previous prime is 21434770517. The next prime is 21434770547. The reversal of 21434770540 is 4507743412.

It is a self number, because there is not a number n which added to its sum of digits gives 21434770540.

It is not an unprimeable number, because it can be changed into a prime (21434770547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 535869244 + ... + 535869283.

It is an arithmetic number, because the mean of its divisors is an integer number (3751084848).

Almost surely, 2^21434770540 is an apocalyptic number.

21434770540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21434770540 is an abundant number, since it is smaller than the sum of its proper divisors (23578247636).

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

21434770540 is a wasteful number, since it uses less digits than its factorization.

21434770540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1071738536 (or 1071738534 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 37.

The spelling of 21434770540 in words is "twenty-one billion, four hundred thirty-four million, seven hundred seventy thousand, five hundred forty".