21053034 has 24 divisors (see below), whose sum is σ = 47305440. Its totient is φ = 7017516.

The previous prime is 21053017. The next prime is 21053041. The reversal of 21053034 is 43035012.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21052998 and 21053016.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21174 + ... + 22145.

It is an arithmetic number, because the mean of its divisors is an integer number (1971060).

Almost surely, 2^21053034 is an apocalyptic number.

21053034 is an abundant number, since it is smaller than the sum of its proper divisors (26252406).

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

21053034 is an equidigital number, since it uses as much as digits as its factorization.

21053034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43336 (or 43324 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 21053034 is about 4588.3585300192. The cubic root of 21053034 is about 276.1244712674.

Adding to 21053034 its reverse (43035012), we get a palindrome (64088046).

The spelling of 21053034 in words is "twenty-one million, fifty-three thousand, thirty-four".