21054574 has 8 divisors (see below), whose sum is σ = 31646160. Its totient is φ = 10505856.

The previous prime is 21054569. The next prime is 21054601. The reversal of 21054574 is 47545012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9459 + ... + 11470.

It is an arithmetic number, because the mean of its divisors is an integer number (3955770).

Almost surely, 2^21054574 is an apocalyptic number.

21054574 is a deficient number, since it is larger than the sum of its proper divisors (10591586).

21054574 is a wasteful number, since it uses less digits than its factorization.

21054574 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21434.

The product of its (nonzero) digits is 5600, while the sum is 28.

The square root of 21054574 is about 4588.5263429559. The cubic root of 21054574 is about 276.1312038095.

Adding to 21054574 its reverse (47545012), we get a palindrome (68599586).

The spelling of 21054574 in words is "twenty-one million, fifty-four thousand, five hundred seventy-four".