21413455 has 48 divisors (see below), whose sum is σ = 32713920. Its totient is φ = 13160448.

The previous prime is 21413449. The next prime is 21413459. The reversal of 21413455 is 55431412.

It is a happy number.

It is not a de Polignac number, because 21413455 - 2⁵ = 21413423 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21413459) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 293299 + ... + 293371.

It is an arithmetic number, because the mean of its divisors is an integer number (681540).

Almost surely, 2^21413455 is an apocalyptic number.

21413455 is a deficient number, since it is larger than the sum of its proper divisors (11300465).

21413455 is a wasteful number, since it uses less digits than its factorization.

21413455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148 (or 131 counting only the distinct ones).

The product of its digits is 2400, while the sum is 25.

The square root of 21413455 is about 4627.4674499125. The cubic root of 21413455 is about 277.6912838557.

Adding to 21413455 its reverse (55431412), we get a palindrome (76844867).

The spelling of 21413455 in words is "twenty-one million, four hundred thirteen thousand, four hundred fifty-five".