21055254 has 32 divisors (see below), whose sum is σ = 46151424. Its totient is φ = 6350880.

The previous prime is 21055217. The next prime is 21055259. The reversal of 21055254 is 45255012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21055259) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16752 + ... + 17964.

It is an arithmetic number, because the mean of its divisors is an integer number (1442232).

Almost surely, 2^21055254 is an apocalyptic number.

21055254 is an abundant number, since it is smaller than the sum of its proper divisors (25096170).

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

21055254 is a wasteful number, since it uses less digits than its factorization.

21055254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1492.

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 21055254 is about 4588.6004402214. The cubic root of 21055254 is about 276.1341765159.

The spelling of 21055254 in words is "twenty-one million, fifty-five thousand, two hundred fifty-four".