21143454 has 32 divisors (see below), whose sum is σ = 44059680. Its totient is φ = 6758400.

The previous prime is 21143453. The next prime is 21143459. The reversal of 21143454 is 45434112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21143453) 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, 14302 + ... + 15710.

It is an arithmetic number, because the mean of its divisors is an integer number (1376865).

Almost surely, 2^21143454 is an apocalyptic number.

21143454 is an abundant number, since it is smaller than the sum of its proper divisors (22916226).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21143454 is a wasteful number, since it uses less digits than its factorization.

21143454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1516.

The product of its digits is 1920, while the sum is 24.

The square root of 21143454 is about 4598.2011700229. The cubic root of 21143454 is about 276.5192127278.

Adding to 21143454 its reverse (45434112), we get a palindrome (66577566).

The spelling of 21143454 in words is "twenty-one million, one hundred forty-three thousand, four hundred fifty-four".