21013476 has 24 divisors (see below), whose sum is σ = 53489184. Its totient is φ = 6367680.

The previous prime is 21013459. The next prime is 21013483. The reversal of 21013476 is 67431012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79465 + ... + 79728.

It is an arithmetic number, because the mean of its divisors is an integer number (2228716).

Almost surely, 2^21013476 is an apocalyptic number.

It is an amenable number.

21013476 is an abundant number, since it is smaller than the sum of its proper divisors (32475708).

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

21013476 is a wasteful number, since it uses less digits than its factorization.

21013476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159211 (or 159209 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 21013476 is about 4584.0458112894. The cubic root of 21013476 is about 275.9514197210.

Adding to 21013476 its reverse (67431012), we get a palindrome (88444488).

The spelling of 21013476 in words is "twenty-one million, thirteen thousand, four hundred seventy-six".