21310470 has 24 divisors (see below), whose sum is σ = 55407456. Its totient is φ = 5682768.

The previous prime is 21310459. The next prime is 21310477. The reversal of 21310470 is 7401312.

It is a super-2 number, since 2×21310470² = 908272263241800, which contains 22 as substring.

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 (21310477) 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, 118302 + ... + 118481.

It is an arithmetic number, because the mean of its divisors is an integer number (2308644).

Almost surely, 2^21310470 is an apocalyptic number.

21310470 is an abundant number, since it is smaller than the sum of its proper divisors (34096986).

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

21310470 is a wasteful number, since it uses less digits than its factorization.

21310470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236796 (or 236793 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 21310470 is about 4616.3264615926. The cubic root of 21310470 is about 277.2453958873.

Adding to 21310470 its reverse (7401312), we get a palindrome (28711782).

The spelling of 21310470 in words is "twenty-one million, three hundred ten thousand, four hundred seventy".