21313026 has 24 divisors (see below), whose sum is σ = 52775424. Its totient is φ = 6089400.

The previous prime is 21313021. The next prime is 21313037. The reversal of 21313026 is 62031312.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21313021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 84450 + ... + 84701.

It is an arithmetic number, because the mean of its divisors is an integer number (2198976).

Almost surely, 2^21313026 is an apocalyptic number.

21313026 is an abundant number, since it is smaller than the sum of its proper divisors (31462398).

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

21313026 is a wasteful number, since it uses less digits than its factorization.

21313026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169166 (or 169163 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 21313026 is about 4616.6032967973. The cubic root of 21313026 is about 277.2564798115.

Adding to 21313026 its reverse (62031312), we get a palindrome (83344338).

The spelling of 21313026 in words is "twenty-one million, three hundred thirteen thousand, twenty-six".