21654152 has 16 divisors (see below), whose sum is σ = 43724940. Its totient is φ = 9994176.

The previous prime is 21654131. The next prime is 21654161. The reversal of 21654152 is 25145612.

It can be written as a sum of positive squares in 2 ways, for example, as 20666116 + 988036 = 4546^2 + 994^2 .

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104003 + ... + 104210.

Almost surely, 2^21654152 is an apocalyptic number.

It is an amenable number.

21654152 is an abundant number, since it is smaller than the sum of its proper divisors (22070788).

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

21654152 is a wasteful number, since it uses less digits than its factorization.

21654152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208232 (or 208228 counting only the distinct ones).

The product of its digits is 2400, while the sum is 26.

The square root of 21654152 is about 4653.4021962431. The cubic root of 21654152 is about 278.7278684997.

Adding to 21654152 its reverse (25145612), we get a palindrome (46799764).

The spelling of 21654152 in words is "twenty-one million, six hundred fifty-four thousand, one hundred fifty-two".