21470750553421 has 16 divisors (see below), whose sum is σ = 24150667161600. Its totient is φ = 18939379789440.

The previous prime is 21470750553397. The next prime is 21470750553443. The reversal of 21470750553421 is 12435505707412.

It is a cyclic number.

It is not a de Polignac number, because 21470750553421 - 2¹⁷ = 21470750422349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21470750553451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33913485 + ... + 34540786.

It is an arithmetic number, because the mean of its divisors is an integer number (1509416697600).

Almost surely, 2^{21470750553421} is an apocalyptic number.

It is an amenable number.

21470750553421 is a deficient number, since it is larger than the sum of its proper divisors (2679916608179).

21470750553421 is a wasteful number, since it uses less digits than its factorization.

21470750553421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68455356.

The product of its (nonzero) digits is 1176000, while the sum is 46.

The spelling of 21470750553421 in words is "twenty-one trillion, four hundred seventy billion, seven hundred fifty million, five hundred fifty-three thousand, four hundred twenty-one".