21002030 has 32 divisors (see below), whose sum is σ = 45480960. Its totient is φ = 6821280.

The previous prime is 21001991. The next prime is 21002039. The reversal of 21002030 is 3020012.

It is a junction number, because it is equal to n+sod(n) for n = 21001999 and 21002017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002039) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6566 + ... + 9225.

It is an arithmetic number, because the mean of its divisors is an integer number (1421280).

Almost surely, 2^21002030 is an apocalyptic number.

21002030 is an abundant number, since it is smaller than the sum of its proper divisors (24478930).

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

21002030 is a wasteful number, since it uses less digits than its factorization.

21002030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15824.

The product of its (nonzero) digits is 12, while the sum is 8.

The square root of 21002030 is about 4582.7971807620. The cubic root of 21002030 is about 275.9013072185.

Adding to 21002030 its reverse (3020012), we get a palindrome (24022042).

The spelling of 21002030 in words is "twenty-one million, two thousand, thirty".