21230010 has 24 divisors (see below), whose sum is σ = 55198260. Its totient is φ = 5661312.

The previous prime is 21229979. The next prime is 21230017. The reversal of 21230010 is 1003212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20766249 + 463761 = 4557^2 + 681^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21229974 and 21230001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21230017) 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, 117855 + ... + 118034.

Almost surely, 2^21230010 is an apocalyptic number.

21230010 is an abundant number, since it is smaller than the sum of its proper divisors (33968250).

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

21230010 is a wasteful number, since it uses less digits than its factorization.

21230010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235902 (or 235899 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 21230010 is about 4607.6034985663. The cubic root of 21230010 is about 276.8960324373.

Adding to 21230010 its reverse (1003212), we get a palindrome (22233222).

The spelling of 21230010 in words is "twenty-one million, two hundred thirty thousand, ten".