21507054 has 8 divisors (see below), whose sum is σ = 43014120. Its totient is φ = 7169016.

The previous prime is 21507007. The next prime is 21507071. The reversal of 21507054 is 45070512.

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

21507054 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1792249 + ... + 1792260.

It is an arithmetic number, because the mean of its divisors is an integer number (5376765).

Almost surely, 2^21507054 is an apocalyptic number.

21507054 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21507054 is a wasteful number, since it uses less digits than its factorization.

21507054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3584514.

The product of its (nonzero) digits is 1400, while the sum is 24.

The square root of 21507054 is about 4637.5698377491. The cubic root of 21507054 is about 278.0952953841.

Adding to 21507054 its reverse (45070512), we get a palindrome (66577566).

The spelling of 21507054 in words is "twenty-one million, five hundred seven thousand, fifty-four".