21453334 has 16 divisors (see below), whose sum is σ = 37381536. Its totient is φ = 9043200.

The previous prime is 21453331. The next prime is 21453347. The reversal of 21453334 is 43335412.

It is a junction number, because it is equal to n+sod(n) for n = 21453299 and 21453308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21453331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11707 + ... + 13414.

It is an arithmetic number, because the mean of its divisors is an integer number (2336346).

Almost surely, 2^21453334 is an apocalyptic number.

21453334 is a deficient number, since it is larger than the sum of its proper divisors (15928202).

21453334 is a wasteful number, since it uses less digits than its factorization.

21453334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25191.

The product of its digits is 4320, while the sum is 25.

The square root of 21453334 is about 4631.7743900151. The cubic root of 21453334 is about 277.8635615706.

Adding to 21453334 its reverse (43335412), we get a palindrome (64788746).

The spelling of 21453334 in words is "twenty-one million, four hundred fifty-three thousand, three hundred thirty-four".