21002630 has 32 divisors (see below), whose sum is σ = 41430528. Its totient is φ = 7602400.

The previous prime is 21002629. The next prime is 21002651. The reversal of 21002630 is 3620012.

It is a super-2 number, since 2×21002630² = 882220933833800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47189 + ... + 47631.

It is an arithmetic number, because the mean of its divisors is an integer number (1294704).

Almost surely, 2^21002630 is an apocalyptic number.

21002630 is a deficient number, since it is larger than the sum of its proper divisors (20427898).

21002630 is a wasteful number, since it uses less digits than its factorization.

21002630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 892.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 21002630 is about 4582.8626424976. The cubic root of 21002630 is about 275.9039345710.

Adding to 21002630 its reverse (3620012), we get a palindrome (24622642).

The spelling of 21002630 in words is "twenty-one million, two thousand, six hundred thirty".