21486254 has 8 divisors (see below), whose sum is σ = 32416200. Its totient is φ = 10680856.

The previous prime is 21486251. The next prime is 21486277. The reversal of 21486254 is 45268412.

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

It is a super-2 number, since 2×21486254² = 923318221905032, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21486254.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21486251) 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, 30704 + ... + 31395.

It is an arithmetic number, because the mean of its divisors is an integer number (4052025).

Almost surely, 2^21486254 is an apocalyptic number.

21486254 is a deficient number, since it is larger than the sum of its proper divisors (10929946).

21486254 is a wasteful number, since it uses less digits than its factorization.

21486254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62274.

The product of its digits is 15360, while the sum is 32.

The square root of 21486254 is about 4635.3267414498. The cubic root of 21486254 is about 278.0056155379.

It can be divided in two parts, 214 and 86254, that added together give a palindrome (86468).

The spelling of 21486254 in words is "twenty-one million, four hundred eighty-six thousand, two hundred fifty-four".