21046254 has 8 divisors (see below), whose sum is σ = 42092520. Its totient is φ = 7015416.

The previous prime is 21046253. The next prime is 21046273. The reversal of 21046254 is 45264012.

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

21046254 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21046253) 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, 1753849 + ... + 1753860.

It is an arithmetic number, because the mean of its divisors is an integer number (5261565).

Almost surely, 2^21046254 is an apocalyptic number.

21046254 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.

21046254 is a wasteful number, since it uses less digits than its factorization.

21046254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3507714.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 21046254 is about 4587.6196442164. The cubic root of 21046254 is about 276.0948266895.

It can be divided in two parts, 210 and 46254, that added together give a palindrome (46464).

The spelling of 21046254 in words is "twenty-one million, forty-six thousand, two hundred fifty-four".