21203010 has 48 divisors (see below), whose sum is σ = 57530304. Its totient is φ = 5407776.

The previous prime is 21203003. The next prime is 21203011. The reversal of 21203010 is 1030212.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 21202983 and 21203001.

It is not an unprimeable number, because it can be changed into a prime (21203011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3052 + ... + 7191.

It is an arithmetic number, because the mean of its divisors is an integer number (1198548).

Almost surely, 2^21203010 is an apocalyptic number.

21203010 is an abundant number, since it is smaller than the sum of its proper divisors (36327294).

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

21203010 is a wasteful number, since it uses less digits than its factorization.

21203010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10279 (or 10276 counting only the distinct ones).

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

The square root of 21203010 is about 4604.6726267999. The cubic root of 21203010 is about 276.7785986021.

Adding to 21203010 its reverse (1030212), we get a palindrome (22233222).

The spelling of 21203010 in words is "twenty-one million, two hundred three thousand, ten".