21880543 has 4 divisors (see below), whose sum is σ = 22144248. Its totient is φ = 21616840.

The previous prime is 21880541. The next prime is 21880549. The reversal of 21880543 is 34508812.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21880543 - 2¹ = 21880541 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21880541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131728 + ... + 131893.

It is an arithmetic number, because the mean of its divisors is an integer number (5536062).

Almost surely, 2^21880543 is an apocalyptic number.

21880543 is a deficient number, since it is larger than the sum of its proper divisors (263705).

21880543 is an equidigital number, since it uses as much as digits as its factorization.

21880543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263704.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 21880543 is about 4677.6642675592. The cubic root of 21880543 is about 279.6958559742.

The spelling of 21880543 in words is "twenty-one million, eight hundred eighty thousand, five hundred forty-three".