21125346 has 16 divisors (see below), whose sum is σ = 46091808. Its totient is φ = 6401600.

The previous prime is 21125329. The next prime is 21125371. The reversal of 21125346 is 64352112.

It is a Curzon number.

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, 159975 + ... + 160106.

It is an arithmetic number, because the mean of its divisors is an integer number (2880738).

Almost surely, 2^21125346 is an apocalyptic number.

21125346 is an abundant number, since it is smaller than the sum of its proper divisors (24966462).

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

21125346 is a wasteful number, since it uses less digits than its factorization.

21125346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320097.

The product of its digits is 1440, while the sum is 24.

The square root of 21125346 is about 4596.2317173963. The cubic root of 21125346 is about 276.4402499113.

Adding to 21125346 its reverse (64352112), we get a palindrome (85477458).

It can be divided in two parts, 2112534 and 6, that added together give a triangular number (2112540 = T₂₀₅₅).

The spelling of 21125346 in words is "twenty-one million, one hundred twenty-five thousand, three hundred forty-six".