21430286791040 has 64 divisors (see below), whose sum is σ = 51933584669760. Its totient is φ = 8454688468992.

The previous prime is 21430286791009. The next prime is 21430286791061. The reversal of 21430286791040 is 4019768203412.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 229301384 + ... + 229394823.

It is an arithmetic number, because the mean of its divisors is an integer number (811462260465).

Almost surely, 2^{21430286791040} is an apocalyptic number.

21430286791040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21430286791040 is an abundant number, since it is smaller than the sum of its proper divisors (30503297878720).

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

21430286791040 is an equidigital number, since it uses as much as digits as its factorization.

21430286791040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458696299 (or 458696287 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 47.

The spelling of 21430286791040 in words is "twenty-one trillion, four hundred thirty billion, two hundred eighty-six million, seven hundred ninety-one thousand, forty".