21012476 has 12 divisors (see below), whose sum is σ = 38935008. Its totient is φ = 9888192.

The previous prime is 21012457. The next prime is 21012503. The reversal of 21012476 is 67421012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154436 + ... + 154571.

It is an arithmetic number, because the mean of its divisors is an integer number (3244584).

Almost surely, 2^21012476 is an apocalyptic number.

It is an amenable number.

21012476 is a deficient number, since it is larger than the sum of its proper divisors (17922532).

21012476 is a wasteful number, since it uses less digits than its factorization.

21012476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309028 (or 309026 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 21012476 is about 4583.9367360381. The cubic root of 21012476 is about 275.9470422793.

Adding to 21012476 its reverse (67421012), we get a palindrome (88433488).

The spelling of 21012476 in words is "twenty-one million, twelve thousand, four hundred seventy-six".