21013475 has 12 divisors (see below), whose sum is σ = 29779344. Its totient is φ = 14409120.

The previous prime is 21013459. The next prime is 21013483. The reversal of 21013475 is 57431012.

It is not a de Polignac number, because 21013475 - 2⁴ = 21013459 is a prime.

It is a super-3 number, since 3×21013475³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 21013475.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59864 + ... + 60213.

It is an arithmetic number, because the mean of its divisors is an integer number (2481612).

Almost surely, 2^21013475 is an apocalyptic number.

21013475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21013475 is a deficient number, since it is larger than the sum of its proper divisors (8765869).

21013475 is a wasteful number, since it uses less digits than its factorization.

21013475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120094 (or 120089 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 21013475 is about 4584.0457022155. The cubic root of 21013475 is about 275.9514153436.

Adding to 21013475 its reverse (57431012), we get a palindrome (78444487).

The spelling of 21013475 in words is "twenty-one million, thirteen thousand, four hundred seventy-five".