21845034 has 24 divisors (see below), whose sum is σ = 50115780. Its totient is φ = 6853248.

The previous prime is 21845029. The next prime is 21845069. The reversal of 21845034 is 43054812.

It can be written as a sum of positive squares in 2 ways, for example, as 16769025 + 5076009 = 4095^2 + 2253^2 .

It is a super-2 number, since 2×21845034² = 954411020922312, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21844989 and 21845007.

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, 35389 + ... + 36000.

Almost surely, 2^21845034 is an apocalyptic number.

21845034 is an abundant number, since it is smaller than the sum of its proper divisors (28270746).

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

21845034 is a wasteful number, since it uses less digits than its factorization.

21845034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71414 (or 71411 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 21845034 is about 4673.8671354672. The cubic root of 21845034 is about 279.5444718946.

Adding to 21845034 its reverse (43054812), we get a palindrome (64899846).

The spelling of 21845034 in words is "twenty-one million, eight hundred forty-five thousand, thirty-four".