21470143433621 has 16 divisors (see below), whose sum is σ = 22171705691520. Its totient is φ = 20777786850240.

The previous prime is 21470143433573. The next prime is 21470143433671. The reversal of 21470143433621 is 12633434107412.

It is a cyclic number.

It is not a de Polignac number, because 21470143433621 - 2²⁶ = 21470076324757 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21470143433671) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 217760291 + ... + 217858863.

It is an arithmetic number, because the mean of its divisors is an integer number (1385731605720).

Almost surely, 2^{21470143433621} is an apocalyptic number.

It is an amenable number.

21470143433621 is a deficient number, since it is larger than the sum of its proper divisors (701562257899).

21470143433621 is a wasteful number, since it uses less digits than its factorization.

21470143433621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145196.

The product of its (nonzero) digits is 290304, while the sum is 41.

The spelling of 21470143433621 in words is "twenty-one trillion, four hundred seventy billion, one hundred forty-three million, four hundred thirty-three thousand, six hundred twenty-one".