21030676 has 12 divisors (see below), whose sum is σ = 37048480. Its totient is φ = 10445400.

The previous prime is 21030637. The next prime is 21030677. The reversal of 21030676 is 67603012.

It is a self number, because there is not a number n which added to its sum of digits gives 21030676.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21030677) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16806 + ... + 18013.

Almost surely, 2^21030676 is an apocalyptic number.

It is an amenable number.

21030676 is a deficient number, since it is larger than the sum of its proper divisors (16017804).

21030676 is a wasteful number, since it uses less digits than its factorization.

21030676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34974 (or 34972 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 21030676 is about 4585.9214995462. The cubic root of 21030676 is about 276.0266899905.

Adding to 21030676 its reverse (67603012), we get a palindrome (88633688).

The spelling of 21030676 in words is "twenty-one million, thirty thousand, six hundred seventy-six".