21245354 has 32 divisors (see below), whose sum is σ = 36309504. Its totient is φ = 9253440.

The previous prime is 21245347. The next prime is 21245383. The reversal of 21245354 is 45354212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34352 + ... + 34964.

It is an arithmetic number, because the mean of its divisors is an integer number (1134672).

Almost surely, 2^21245354 is an apocalyptic number.

21245354 is a deficient number, since it is larger than the sum of its proper divisors (15064150).

21245354 is a wasteful number, since it uses less digits than its factorization.

21245354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702.

The product of its digits is 4800, while the sum is 26.

The square root of 21245354 is about 4609.2682716457. The cubic root of 21245354 is about 276.9627252862.

Adding to 21245354 its reverse (45354212), we get a palindrome (66599566).

The spelling of 21245354 in words is "twenty-one million, two hundred forty-five thousand, three hundred fifty-four".