21073475 has 6 divisors (see below), whose sum is σ = 26131140. Its totient is φ = 16858760.

The previous prime is 21073471. The next prime is 21073511. The reversal of 21073475 is 57437012.

It is not a de Polignac number, because 21073475 - 2² = 21073471 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21073471) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 421445 + ... + 421494.

It is an arithmetic number, because the mean of its divisors is an integer number (4355190).

Almost surely, 2^21073475 is an apocalyptic number.

21073475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21073475 is a deficient number, since it is larger than the sum of its proper divisors (5057665).

21073475 is an equidigital number, since it uses as much as digits as its factorization.

21073475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 842949 (or 842944 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 29.

The square root of 21073475 is about 4590.5854746426. The cubic root of 21073475 is about 276.2138081072.

The spelling of 21073475 in words is "twenty-one million, seventy-three thousand, four hundred seventy-five".