21235416 has 32 divisors (see below), whose sum is σ = 53514240. Its totient is φ = 7021728.

The previous prime is 21235367. The next prime is 21235427. The reversal of 21235416 is 61453212.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 436 + ... + 6531.

It is an arithmetic number, because the mean of its divisors is an integer number (1672320).

Almost surely, 2^21235416 is an apocalyptic number.

It is an amenable number.

21235416 is an abundant number, since it is smaller than the sum of its proper divisors (32278824).

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

21235416 is a wasteful number, since it uses less digits than its factorization.

21235416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7103 (or 7099 counting only the distinct ones).

The product of its digits is 1440, while the sum is 24.

The square root of 21235416 is about 4608.1901002454. The cubic root of 21235416 is about 276.9195333355.

Adding to 21235416 its reverse (61453212), we get a palindrome (82688628).

The spelling of 21235416 in words is "twenty-one million, two hundred thirty-five thousand, four hundred sixteen".