21345052 has 12 divisors (see below), whose sum is σ = 37396800. Its totient is φ = 10660256.

The previous prime is 21345031. The next prime is 21345067. The reversal of 21345052 is 25054312.

It is a super-2 number, since 2×21345052² = 911222489765408, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1653 + ... + 6739.

It is an arithmetic number, because the mean of its divisors is an integer number (3116400).

Almost surely, 2^21345052 is an apocalyptic number.

It is an amenable number.

21345052 is a deficient number, since it is larger than the sum of its proper divisors (16051748).

21345052 is a wasteful number, since it uses less digits than its factorization.

21345052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6140 (or 6138 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 21345052 is about 4620.0705622317. The cubic root of 21345052 is about 277.3952833799.

Adding to 21345052 its reverse (25054312), we get a palindrome (46399364).

The spelling of 21345052 in words is "twenty-one million, three hundred forty-five thousand, fifty-two".