21173054 has 8 divisors (see below), whose sum is σ = 36296688. Its totient is φ = 9074160.

The previous prime is 21173029. The next prime is 21173057. The reversal of 21173054 is 45037112.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21173057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 756167 + ... + 756194.

It is an arithmetic number, because the mean of its divisors is an integer number (4537086).

Almost surely, 2^21173054 is an apocalyptic number.

21173054 is a deficient number, since it is larger than the sum of its proper divisors (15123634).

21173054 is a wasteful number, since it uses less digits than its factorization.

21173054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1512370.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 21173054 is about 4601.4186942725. The cubic root of 21173054 is about 276.6481912148.

The spelling of 21173054 in words is "twenty-one million, one hundred seventy-three thousand, fifty-four".