21313454 has 4 divisors (see below), whose sum is σ = 31970184. Its totient is φ = 10656726.

The previous prime is 21313451. The next prime is 21313469. The reversal of 21313454 is 45431312.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21313451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5328362 + ... + 5328365.

It is an arithmetic number, because the mean of its divisors is an integer number (7992546).

Almost surely, 2^21313454 is an apocalyptic number.

21313454 is a deficient number, since it is larger than the sum of its proper divisors (10656730).

21313454 is a wasteful number, since it uses less digits than its factorization.

21313454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10656729.

The product of its digits is 1440, while the sum is 23.

The square root of 21313454 is about 4616.6496509915. The cubic root of 21313454 is about 277.2583357185.

Adding to 21313454 its reverse (45431312), we get a palindrome (66744766).

The spelling of 21313454 in words is "twenty-one million, three hundred thirteen thousand, four hundred fifty-four".