21001302 has 48 divisors (see below), whose sum is σ = 54295920. Its totient is φ = 5999616.

The previous prime is 21001247. The next prime is 21001319. The reversal of 21001302 is 20310012.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1323 + ... + 6614.

It is an arithmetic number, because the mean of its divisors is an integer number (1131165).

Almost surely, 2^21001302 is an apocalyptic number.

21001302 is an abundant number, since it is smaller than the sum of its proper divisors (33294618).

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

21001302 is a wasteful number, since it uses less digits than its factorization.

21001302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7962 (or 7949 counting only the distinct ones).

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

The square root of 21001302 is about 4582.7177526005. The cubic root of 21001302 is about 275.8981192969.

Adding to 21001302 its reverse (20310012), we get a palindrome (41311314).

The spelling of 21001302 in words is "twenty-one million, one thousand, three hundred two".