21430543040149 has 4 divisors (see below), whose sum is σ = 21599287473664. Its totient is φ = 21261798606636.

The previous prime is 21430543040131. The next prime is 21430543040173. The reversal of 21430543040149 is 94104034503412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21430543040149 - 2¹⁵ = 21430543007381 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 (21430543040129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84372216567 + ... + 84372216820.

It is an arithmetic number, because the mean of its divisors is an integer number (5399821868416).

Almost surely, 2^{21430543040149} is an apocalyptic number.

It is an amenable number.

21430543040149 is a deficient number, since it is larger than the sum of its proper divisors (168744433515).

21430543040149 is a wasteful number, since it uses less digits than its factorization.

21430543040149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168744433514.

The product of its (nonzero) digits is 207360, while the sum is 40.

The spelling of 21430543040149 in words is "twenty-one trillion, four hundred thirty billion, five hundred forty-three million, forty thousand, one hundred forty-nine".