21034975 has 24 divisors (see below), whose sum is σ = 28591920. Its totient is φ = 15256320.

The previous prime is 21034973. The next prime is 21034997. The reversal of 21034975 is 57943012.

It is not a de Polignac number, because 21034975 - 2¹ = 21034973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21034973) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18627 + ... + 19723.

It is an arithmetic number, because the mean of its divisors is an integer number (1191330).

Almost surely, 2^21034975 is an apocalyptic number.

21034975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21034975 is a deficient number, since it is larger than the sum of its proper divisors (7556945).

21034975 is a wasteful number, since it uses less digits than its factorization.

21034975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1179 (or 1174 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 21034975 is about 4586.3901927333. The cubic root of 21034975 is about 276.0454967706.

Adding to 21034975 its reverse (57943012), we get a palindrome (78977987).

The spelling of 21034975 in words is "twenty-one million, thirty-four thousand, nine hundred seventy-five".