21250225666343 has 16 divisors (see below), whose sum is σ = 21408426943200. Its totient is φ = 21092545130496.

The previous prime is 21250225666321. The next prime is 21250225666367. The reversal of 21250225666343 is 34366652205212.

It is a cyclic number.

It is not a de Polignac number, because 21250225666343 - 2²⁰ = 21250224617767 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 (21250225666543) 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, 1322098955 + ... + 1322115027.

It is an arithmetic number, because the mean of its divisors is an integer number (1338026683950).

Almost surely, 2^{21250225666343} is an apocalyptic number.

21250225666343 is a deficient number, since it is larger than the sum of its proper divisors (158201276857).

21250225666343 is a wasteful number, since it uses less digits than its factorization.

21250225666343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31666.

The product of its (nonzero) digits is 3110400, while the sum is 47.

The spelling of 21250225666343 in words is "twenty-one trillion, two hundred fifty billion, two hundred twenty-five million, six hundred sixty-six thousand, three hundred forty-three".