21313410 has 96 divisors (see below), whose sum is σ = 57335040. Its totient is φ = 5051904.

The previous prime is 21313379. The next prime is 21313429. The reversal of 21313410 is 1431312.

It is a super-2 number, since 2×21313410² = 908522891656200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21313410.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 269751 + ... + 269829.

It is an arithmetic number, because the mean of its divisors is an integer number (597240).

Almost surely, 2^21313410 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21313410, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28667520).

21313410 is an abundant number, since it is smaller than the sum of its proper divisors (36021630).

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

21313410 is a wasteful number, since it uses less digits than its factorization.

21313410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152 (or 129 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 21313410 is about 4616.6448856285. The cubic root of 21313410 is about 277.2581449254.

Adding to 21313410 its reverse (1431312), we get a palindrome (22744722).

The spelling of 21313410 in words is "twenty-one million, three hundred thirteen thousand, four hundred ten".