21436450 has 48 divisors (see below), whose sum is σ = 46247040. Its totient is φ = 7240320.

The previous prime is 21436417. The next prime is 21436453. The reversal of 21436450 is 5463412.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (21436453) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25131 + ... + 25969.

It is an arithmetic number, because the mean of its divisors is an integer number (963480).

Almost surely, 2^21436450 is an apocalyptic number.

21436450 is an abundant number, since it is smaller than the sum of its proper divisors (24810590).

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

21436450 is a wasteful number, since it uses less digits than its factorization.

21436450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 931 (or 926 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 21436450 is about 4629.9514036327. The cubic root of 21436450 is about 277.7906485888.

Adding to 21436450 its reverse (5463412), we get a palindrome (26899862).

The spelling of 21436450 in words is "twenty-one million, four hundred thirty-six thousand, four hundred fifty".